Ray Optics-Lens Formula [HBCSE Olympiads (Homi Bhabha Centre for Science Edu.) NSEP (Nat. Standard Exam in Physics)]: Questions 1 - 2 of 2
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Question 1
Appeared in Year: 2016
Question MCQ▾
Two identical lenses made of the same material of refractive index have the focal length 12 cm. These are kept in contact and immersed in a liquid of refractive index . The combination behaves as –
Choices
Choice (4) | Response | |
---|---|---|
a. | Convex lens of focal length | |
b. | Convex lens of focal length | |
c. | Convex lens of focal length | |
d. | Convex lens of focal length |
Question 2
Question MCQ▾
Consider a manual camera with a lens having a focal length of 5 cm. It is focused at infinity. For catching the picture of an object at a distance of 30 cm, one would
Choices
Choice (4) | Response | |
---|---|---|
a. | Find it impossible to catch the picture | |
b. | Move the lens out by about 1 cm | |
c. | Move the lens out by about 5 cm | |
d. | Move the lens in by about 1 cm |