Lakhmir Singh Physics Class 10 Solutions Page No:178
Question 1: Name the spherical mirror which has :
virtual principal focus.
real principal focus.
Solution : (a) Convex mirror (b) Concave mirror
Question 2: Out of convex mirror and concave mirror, whose focus is situated behind the mirror ?
Solution : Convex mirror
Question 3: Find the focal length of a concave mirror whose radius of curvature is 32 cm.
Solution : Radius of curvature (R) = 32cm
Focal length (f) = ?
We know that
f = R/2
= 32/2
f = 16cm
Question 4: If the focal length of a convex mirror is 25 cm, what is its radius of curvature ?
Solution : Focal length (f) = 25 cm
Radius of curvature (R) = ?
We know that
f = R/2
25=R/2
R= 25 x 2
R = 50 cm.