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Focal Length

CBSE X Physics Light - Reflection and Refraction

what is focal length of a plane mirror/

Asked by 22nd February 2008 12:32 AM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

How to know that the given focal length/dictance is positive or negative

Asked by 24th February 2008 11:30 AM
Answered by Expert

CBSE IX Physics

How to find out the radius of curvature of a covex lens when focal length is given?

Asked by 12th March 2008 9:13 PM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

what will happen to the focal length of a concave mirror, convex mirror, concave lens and convex lens when immersed in water? will it change ? if yes explain .(3 marks)

Asked by Rida Mukadam 21st February 2015 7:43 PM
Answered by Expert

CBSE XII Science Physics Ray Optics and Optical Instruments

establish the relation 1/u+1/v=1/f for a concave mirror forming virtual image

Asked by uttam kumar 23rd February 2015 9:31 AM
Answered by Expert

CBSE XII Science Physics Ray Optics and Optical Instruments

Q.On a convex lens ,light of red and violet colour is incident separately , then how does the focal length of lens change?

Asked by Ravi consul 4th March 2015 6:48 PM
Answered by Expert

CBSE XII Science Physics

a convex lens of focal length f is cut into two halves such that one surface of each is plane what is the focal length of each half

Asked by deepakphy93 3rd January 2018 1:08 PM
Answered by Expert

CBSE X Science

Prove mathematically that r=2f for mirror.  

Asked by shyamala.holla3 16th February 2018 3:35 PM
Answered by Expert

CBSE XII Science Physics

Dera sir, please explain the displacement method to find the focal length of the convex lens in detail

Asked by modi72879 22nd February 2018 10:03 PM
Answered by Expert

CBSE X Physics

PLS EXPLAIN

Asked by gpnkumar0 14th March 2018 9:17 PM
Answered by Expert

CBSE X Physics

PLS EXPLAIN

Asked by gpnkumar0 14th March 2018 9:28 PM
Answered by Expert

JEE Plances JEE (Main) Physics

plz solve the question with explanation

Asked by futureisbright051101 11th April 2018 6:41 AM
Answer Verified by Expert

JEE Plances JEE (Main) Physics

plz solve the question with explanation

Asked by futureisbright051101 11th April 2018 6:49 AM
Answer Verified by Expert

ICSE X Physics

Q. 1

Asked by Rayeesa 25th April 2018 9:53 PM
Answered by Expert

ICSE X Physics Refraction Through a Lens

Q. 2

Asked by Rayeesa 25th April 2018 9:54 PM
Answered by Expert

CBSE X Physics

a convexmirror is held in water how focal length will be changed  

Asked by yanamika14b 30th June 2018 7:57 PM
Answered by Expert

CBSE X Physics

why R=2f??? state the reason.

Asked by edayoor 11th August 2018 9:45 PM
Answered by Expert

NEET1 NEET1 Physics

Please answer the following question with explanation 

Asked by kkudgiri55 19th October 2018 5:28 PM
Answered by Expert

NEET1 NEET1 Physics

Please answer the following question with explanation

Asked by kkudgiri55 20th October 2018 3:37 PM
Answered by Expert

Gujarat X Physics

relation between focal length and radius of curvatyre

Asked by hetvpatel444 3rd December 2018 9:49 AM
Answered by Expert

CBSE XII Science Physics Ray Optics and Optical Instruments

please solve the question in the picture.

Asked by rohitraman1115 12th January 2019 12:19 PM
Answered by Expert

CBSE XII Science Physics

kindly answer pl

Asked by jain.pradeep 19th February 2019 10:30 AM
Answered by Expert

ICSE X Physics

If the lens is placed in water instead of air its focal length increases why?

Asked by aditisinha952003 2nd March 2019 7:23 PM
Answered by Expert

ICSE IX Physics Reflection of Light

An object is front of convex mirror at distance of 0.24m with focal length of 0.15m find the value of image formed

Asked by dhruvikapinni 5th April 2019 1:55 PM
Answered by Expert

JEE Main Physics Optics

solve

Asked by sarveshvibrantacademy 29th April 2019 10:52 AM
Answered by Expert

JEE Main Physics

solve

Asked by sarveshvibrantacademy 30th April 2019 10:59 AM
Answered by Expert

CBSE X Physics

how to find focal length of a lens in another medium

Asked by krishnasajeevan4601 3rd May 2019 6:43 AM
Answered by Expert

JEE Main Physics Optics

solve

Asked by eknathmote50 8th May 2019 10:30 AM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

Does focal length of concave lens change when immersed in water?

Asked by anamikasingla116 5th July 2019 11:24 AM
Answered by Expert

NEET NEET Physics

Please answer this

Asked by Prashant DIGHE 30th July 2019 7:56 AM
Answered by Expert

NEET NEET Physics

Please answer this

Asked by Prashant DIGHE 30th July 2019 8:15 AM
Answered by Expert

ICSE X Physics Refraction Through a Lens

How is the focal length of a lens affected by change in(1) radii of curvature of two surfaces of lens (2)refractive index of the material of lens?

Asked by Kanwaranita10 7th August 2019 5:41 PM
Answered by Expert

CBSE X Physics

what will be F (focal length)

Asked by aditya.rane 10th August 2019 4:09 PM
Answered by Expert

CBSE X Physics

What is the difference between principal focus and focal length?

Asked by shreyashahi3014 11th August 2019 10:02 PM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

What is Radius of Curvature, Optic centre, focal length?

Asked by vaibhavsingh73329 10th September 2019 2:15 PM
Answered by Expert

CBSE X Physics The Human Eye and The Colourful World

Is the distance between lens and retina of the eye always remains the same?    

Asked by Vishalgarg12345678 10th October 2019 5:15 PM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

A concave mirror has a magnification of -2.5 if its focal length is 20 cm find its image and object position? 

Asked by ajajaysanja 23rd October 2019 11:00 AM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

Difference between focal length and radius of curvature?!

Asked by drhimasingh 30th November 2019 12:22 PM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

Define 1 dioptre of power of lens   

Asked by lalaarmaan4141 16th December 2019 12:41 PM
Answered by Expert

CBSE X Physics

Define the focal length of lens    

Asked by dilipvenkat259 10th January 2020 4:53 AM
Answered by Expert

CBSE X Physics The Human Eye and The Colourful World

What is the focal length and power of eye lens of a healthy person

Asked by saradamahapatra9999 12th February 2020 10:24 AM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

radius of curvature of a concave mirror is twenty five centimeter what is its focal length

Asked by pandeyriddima6 11th September 2020 1:49 PM
Answered by Expert

ICSE X Physics

How to find focal length of combination

Asked by rsharini.04 23rd November 2020 7:43 AM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

Science

Asked by panwarn1234 2nd December 2020 2:43 PM
Answered by Expert

CBSE X Physics Light - Reflection and Refraction

The relation between focal length and radius of curvature is given by    

Asked by pothireddysonyreddy27 24th January 2021 5:41 PM
Answered by Expert

NEET NEET Physics

the power of convex lens of refractive index 1.5 is 0.5D in air in water refractive index 4÷3 it's focal length will be

Asked by racchurashmi74 10th February 2021 6:05 AM
Answered by Expert

ICSE X Physics Light - Reflection and Refraction

 If focal length of a biconvex lens are 20cm and 40cmr respectivily& refractive index is 1.5, then find the combination focal length of givenl lens?

Asked by narendra172193 9th April 2021 3:27 PM
Answered by Expert

CBSE X Physics Electricity

This is the question from class 10 light chapter asked in our state model paper

Asked by akashsrnm 8th May 2021 7:21 PM
Answered by Expert

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