JEE 2020 Physics: Ray Optics Quiz 3 (23.09.2019) for JEE & BITSAT Exams

Question 1

For the myopic eye, the defect is cured by

Question 2

The distance between an object and its real image produced by a converging lens is 0.72 m. The magnification is 2. What will be the magnification when the object is moved by 0.04 m towards the lens?

Question 3

Radii of curvature of a converging lens are in the ratio 1 : 2. Its focal length is 6 cm and reractive index is 1.5. Then its radii of curvature are_____ respectively.

Question 4

The power of a think convex lens (_an_g = 1.5) is 5.0 D. When it is placed in a liquid of refractive index _an₁, then it behaves as a concave lens of focal length 100 cm. The refractive index of the liquid _an₁ will be

Question 5

Two convex lenses of power 2D and 3D are separated by a distance $Description: E:\VITJEE\Vitjee-2015-Physics_files\image105.png$ m. The power of optical system formed is

Question 6

A convex lens of focal length 15cm is placed in front of a plane mirror at a distance 25cm from the mirror. Where on the optical axis and from the centre of the lens should a small object be placed such that the final image coincides with the object?

Question 7

A point source of light is placed at

from a converging lens of focal length f. A flat mirror is placed on the other side of the lens at a distance d such that rays reflected from the mirror are parallel after passing through the lens again. If

cm, then d (in cm) is equal to

Question 8

A wire mesh consisting of very small squares is viewed at a distance of 8 cm through a magnifying converging lens of focal length 10 cm, kept close to the eye. The magnification produced by the lens is

Question 9

A point object is placed 20 cm left of a convex lens of focal length f=5cm cm (see the figure). The lens is made to oscillate with small amplitude A along the horizontal axis. The image of the object will also oscillate along the axis with

Question 10

A point source of light is moving at a rate of 2 cm-s^-1 towards a thin convex lens of focal length 10 cm along its optical axis. When the source is 15 cm away from the lens the image is moving at