JEE Main 2022 · 29 Jun · Shift 1 · Physics Q59

← JEE Main 2022 · 29 Jun · Shift 1

PhysicsInteger+4 / -1Question 59 of 90

A parallel beam of light is allowed to fall on a transparent spherical globe of diameter 30 cm and refractive index 1.5. The distance from the centre of the globe at which the beam of light can converge is ______ mm.

Your answer

Answer and worked solution

Official answer: 225

Ball lens. Focal length from the centre $f=\dfrac{\mu R}{2(\mu-1)}=\dfrac{1.5\times15}{1}=22.5$ cm $=225$ mm.

Answer: 225

Topics:Refraction at spherical surfaces

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JEE Main 2022 · 29 Jun · Shift 1, Physics question 59