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## what is focal length of a plane mirror/

Asked by 22nd February 2008 12:32 AM

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

Asked by 24th February 2008 11:30 AM

## 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

## 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

## 1. detemine the focal length of a spherical mirror which forms a 3 times magnified real image of an object placed 16 cm in front of it. Will m=3 or m= -3 why   2.the image  of an object placed 36 cm from a shpericl lens is formed on a screen at a distace of 72 cm from lens Find its f? Will v=72 or v= -72  why

Asked by P S Lakshmi 4th March 2015 12:49 PM

## 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

## an object is placed at a distance of f/2 from a concavex lens. The image will be? A-at 3f/2,real and Inverted.B-at 2f virtual and erect. C-at f real and inverted. D-at one of the foci virtual and double size.

Asked by Priyanka 13th November 2017 9:35 PM

## 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

## A convex lens is placed in contact with a plane mirror. a point object is placed 20cm on the axis of the combination has its image coincideing with itself.what is the focal length of the lens?

Asked by vasturushi 1st February 2018 9:50 PM

## Prove mathematically that r=2f for mirror.

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

## 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

## PLS EXPLAIN

Asked by gpnkumar0 14th March 2018 9:17 PM

## PLS EXPLAIN

Asked by gpnkumar0 14th March 2018 9:28 PM

## A Compound lens is made up of two thin lenses having + 12.5 D   -2.5 D find the focal length and the power of combination

Asked by Ak9639315541 14th March 2018 10:00 PM

## plz solve the question with explanation

Asked by futureisbright051101 11th April 2018 6:41 AM

## plz solve the question with explanation

Asked by futureisbright051101 11th April 2018 6:49 AM

## Q. 1

Asked by Rayeesa 25th April 2018 9:53 PM

## Q. 2

Asked by Rayeesa 25th April 2018 9:54 PM

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

Asked by yanamika14b 30th June 2018 7:57 PM

## A real image produced by a concave mirror is found to be 4 times the size of the object. If the distance of the mirror is 20 cm from the object, find the focal length.

Asked by lakhinandanbora21590 11th July 2018 5:44 PM

## why R=2??? state the reason.

Asked by edayoor 11th August 2018 9:45 PM

### NEET1 NEET1 Physics

Asked by kkudgiri55 19th October 2018 5:28 PM

### NEET1 NEET1 Physics

Asked by kkudgiri55 20th October 2018 3:37 PM

## relation between focal length and radius of curvatyre

Asked by hetvpatel444 3rd December 2018 9:49 AM

## please solve the question in the picture.

Asked by rohitraman1115 12th January 2019 12:19 PM

## Q. An object is placed at a distance of 24 cm in front of a convex lens of focal length 8 cm. (i) What is the nature of the image formed? (ii) Calculate the distance of the image from the lens. (iii) Calculate the magnification of the image.

Asked by akshushashu123 6th March 2019 10:00 AM

## 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

## A lens of focal length 20 cm forms the image of a bright object kept 30 cm from it on a screen. If the lens is replaced by another lens, the object has to be moved by 5 cm to obtain a sharp image on the screen. Find the possible values of the focal length of the second lens.

Asked by k.suman39 19th April 2019 9:08 AM

## how to find focal length of a lens in another medium

Asked by krishnasajeevan4601 3rd May 2019 6:43 AM

## solve

Asked by eknathmote50 8th May 2019 10:30 AM

## A real image 2 times the size of an object is formed by a concave mirror.  When the mirror and the object are shifted,  the image formed becomes 4 times the size of the object. Find the focal length of the mirror if the image were to be shifted 24cm

Asked by bukokaakinsola39 31st May 2019 8:56 AM

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

Asked by anamikasingla116 5th July 2019 11:24 AM

### NEET NEET Physics

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

### NEET NEET Physics

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

## 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

## What is the difference between principal focus and focal length?

Asked by shreyashahi3014 11th August 2019 10:02 PM

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

Asked by vaibhavsingh73329 10th September 2019 2:15 PM

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

Asked by Vishalgarg12345678 10th October 2019 5:15 PM

## 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

## Difference between focal length and radius of curvature?!

Asked by drhimasingh 30th November 2019 12:22 PM

## Define 1 dioptre of power of lens

Asked by lalaarmaan4141 16th December 2019 12:41 PM

## Define the focal length of lens

Asked by dilipvenkat259 10th January 2020 4:53 AM

## A screen bearing a real image of magnification m1,formed by a convex lens,is moved by a distance x.The object is then moved until a new image of magnification m2 is formed on screen.The focal lenght of lens is: (1) . x/m2-m1 (2) . m2-m1/x (3) . x/m1-m2 (4) . m1-m2/x

Asked by dfojajjar 16th February 2020 1:35 PM

## The focal length of convex lens 20 cm. It is kept in contact with a concave lens of focal length 25cm. Determine the focal length and power of the combined lens.

Asked by imranbharveli 7th March 2020 7:47 PM

## 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

## How to find focal length of combination

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

## Science

Asked by panwarn1234 2nd December 2020 2:43 PM

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

Asked by pothireddysonyreddy27 24th January 2021 5:41 PM

## 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

## 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

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

Asked by akashsrnm 8th May 2021 7:21 PM

## two thin lenses of power +3.5 D and -2.5 D are placed in contact . What is the focal length of the lens combination

Asked by smithasumi1976 12th September 2021 12:23 PM

## how to determine whether focal length is negative or positive

Asked by studyworkofficial 18th November 2021 6:41 PM

## if for a perfectly symmertical lens, r1=r2, then how will we find focal length??

Asked by Dark 5th January 2022 11:54 AM