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Chapter 9 - Ray Optics and Optical Instruments | 5 questions

Timed test. Answer every question before time runs out. Correct answers and solutions appear after submission.
Time remaining 480
Question 1 of 5
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Question 1 of 5
CBSE Past Year 2026

A plano-convex lens, made of glass (n = 1·5) has a curved surface whose radius is 40 cm. The image formed of an object is of the same size as that of the object. The distance of the object from the lens is :

Select one option. Answers are shown after the test.
Question 2 of 5
CBSE Past Year 2026

In which of the following, total internal reflection does not occur?

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Question 3 of 5
CBSE Past Year 2026

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 4 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 5 of 5
CBSE Past Year 2026

A thin plano-convex lens and a thin equi-concave lens are kept coaxially in contact as shown in the figure. Assuming both the lenses are made of glass of refractive index \(\mu\), and R is the radius of curvature of each curved surface, the focal length of the combination is:

Plano-convex and equi-concave lenses in contact

Select one option. Answers are shown after the test.