Question

Light from a point source in air falls on a spherical glass (n=1.5 and radius of curvature=20cm .At what position the image is formed ​

Answer 1

Hi!

Solution:-

Given :- u = - 100cm , v = ? , R = +20cm , n1 = 1 n2 = 1.5

We use the formula of relation between object and image distance in terms of refractive index of the medium and the radius of the curvature of curved spherical surface.

We have then ,

1.5/v + 1/100 = 0.5/20

or, v = +100 cm

the image is formed at s distance of 100 cm from the glass surface . in the direction of incident light .

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Hope it helps you !!

@Raj❤

Answer 2

Answer:

v = 1 m

Explanation:

Given:

For air, n1 = 1

For glass, n2 = 1.5

R = 20 cm = 0.2 m

u = -100 cm = -1 m

Solution:

Using formula for refraction at single spherical surface -

n2/v - n1/u = (n2-n1)/R

1.5/v + 1/1 = (1.5-1)/0.2

1.5/v = 2.5 - 1

v = 1.5/1.5

v = 1 m

v = 100 cm

Image will be formed at 1 m.