Question

A concave mirror of 10m radius is to be used in solar cooker . How far must the cooker be placed from the optical centre of the mirror for to receive maximum solar energy ?

Answer 1

Answer:

5 m

Explanation:

since r =2f

and we know that at f rays are at infinity

Answer 2

Answer:

the solar cocker should be placed at 5m.

Explanation:

we know that maximum amount of energy is at focus .

always R=2f focal length is the half of the radius of curvature .

so given radius is R=10m

R=2f

f=R/2

f=10/2

f=5m.

I hope it will help you .plz fallow me .