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Class 12 Physics Chapter 9 - Ray Optics and Optical Instruments MCQ and Assertion Questions

Short Quiz · Class 12 · Physics · CBSE

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Chapter 9 - Ray Optics and Optical Instruments | 5 questions | about 4 minutes

Practise Chapter 9 - Ray Optics and Optical Instruments with Teachoo's Short Quiz (Class 12 · Physics · CBSE). Practise these questions in a free interactive quiz with answer feedback.

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Question 1 of 5
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Question 1 of 5
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A telescope has an objective lens of focal length 144 cm and an eyepiece of focal length 6·0 cm. The magnifying power and the length of telescope tube will be respectively :

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Question 2 of 5
CBSE Past Year 2026

A ray of yellow light undergoes total internal reflection when it is incident at the interface of two media. This ray is successively replaced by the ray of blue, green and red lights. Which of the following statements is true if the angle of incidence is same in all cases ?

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Question 3 of 5
CBSE Past Year 2026

An equiconvex lens of focal length 15 cm is cut into two equal plano-convex halves. The focal length of each half will be :

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Question 4 of 5
CBSE Past Year 2026

A concave lens of focal length 10 cm is cut into two identical plano-concave lenses. The focal length of each lens will be

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Question 5 of 5
CBSE Past Year 2026

Assertion (A) : When a convex lens made of glass is immersed in water, its converging power increases.

Reason (R) : The focal length of a lens depends only on the radii of curvature of its two faces.

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Practice · Chapter 9 - Ray Optics and Optical Instruments