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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEP
Chapter: Ray Optics

Olympiad workbook · NSEP · Ray Optics

A student uses a convex lens to determine the width of a slit. For...

A student uses a convex lens to determine the width of a slit. For this he fixes the positions of the object and the screen and moves the lens to get a real image on the screen. The images of the slit width are found to be 2.1 cm and 0.48 cm wide respectively when the lens is moved through 15 cm . Therefore, the slit width and the focal length of the lens respectively, are

Options

A $1 \mathrm{~cm}, 9.3 \mathrm{~cm}$
B $1 \mathrm{~cm}, 10.5 \mathrm{~cm}$
C $2 \mathrm{~cm}, 12.8 \mathrm{~cm}$
D $2 \mathrm{~cm}, 15.2 \mathrm{~cm}$

Correct answer

A. $1 \mathrm{~cm}, 9.3 \mathrm{~cm}$

Step-by-step solution

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