A glass sphere $(μ = 1.5)$ of radius 8 cm is placed in sunlight. Where is the image of the sun formed by the light passing through the sphere? When refraction by first surface of sphere

24 cm

As the sun is very far away, the incident ray can be assumed as coming from infinity.

For refraction at first surface:

Using $\frac{m_1}{u}+\frac{m_2}{v}=\frac{m_2-m_1}{R}$

$⇒\frac{1}{∞}+\frac{1.5}{v_1}=\frac{1.5-1}{+8}$

$⇒v_1=24cm$