10th Nov Ray Optics Quiz 3 – Punjab Meritorious School Preparation Portal

Welcome to your 10 Nov Ray Optics And Optical Instrument Quiz 3 CBT TEST

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School Name with City

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Focal length of a convex lens will be maximum for

blue light

yellow light

green light

red light

90°

60°

30°

45°

30°

45°

60°

75°

A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in dioptres of the combination is

50

Infinite

Zero

25

A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively:

30°

60°

0°

45°

A body is located on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance 'd ahead of second wall, then the required focal length will be

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