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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