Previous Year Questions on Ray Optics for JEE & BITSAT Exams

Question 1

A convex lens forms a real image on a screen placed at a distance 60 cm from the object. When the lens is shifted towards the screen by 20 cm, another image of the object is formed on the screen. The focal length of the lens is -

Question 2

For a spherical surface of radius of curvature R, separating two media of refractive indices μ₁ and μ₂, the two principal focal lengths are f₁ and f₂ respectively. Which one of the following relations is correct -

Question 3

A convex lens of focal length f is placed somewhere in between an object and a screen. The distance between the object and the screen is x. If the numerical value of the magnification produced by the lens is m, the focal length of the lens is -

Question 4

A screen is placed a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens -

Question 5

In the figure given below, there are two convex lens L₁ and L₂ having focal lengths F₁ and F₂ respectively. The distance between L₁ and L₂ will be,

Question 6

A lens of focal length 0.3 m is placed between an illuminated object and screen which are 1 m apart. By varying the position of the lens, it is possible to produce on the screen -

Question 7

A parallel beam of light is incident on a converging lens parallel to its principal axis. As ray moves away from the lens on the other side on its principal axis, the intensity of light -

Question 8

At what distance from a concave mirror of focal length 10 cm must an object be placed in order that an image double its size may be obtained -

Question 9

A point object is placed midway between two plane mirrors distance 'a' apart. The plane mirrors form an infinite number of images due to multiple reflections. The distance between n^th order images formed in the two mirrors is -

Question 10

Figure shows a cubical room ABCD with the wall CD as a plane mirror. Each side of the room is 3m. We place a camera at the mid-point of the wall AB. At what distance should the camera be focussed to photograph an object placed at A -