JEE PHYSICS MCQ: RAY OPTICS

1 Medium

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A person who can see things most clearly at a distance of 10 cm, requires spectacles to enable to see clearly things at a distance of 30 cm. What should be the focal length of the spectacles?

View answer and explanation

Correct option: A

15 cm (Concave)

Answer A (3) is correct because the ratio

F_1/F_2

is calculated using the given condition

\tan \theta = 2\mu

and the formulas for

F_1

and

F_2

More Questions from RAY OPTICS

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In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium A double convex lens is made of glass which has its refractive index 1,45 for violet rays and 1.50 for red rays. If the focal length for violet ray is

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16 {~mm}

. He views the cavity in the tooth of a patient by holding the mirror at a distance of

8 {~mm}

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