Question

A 4 cm size object placed at a distance of 20 cm from a concave mirror whose radius of curvature is 30 cm. Find the nature,size and position of the image formed.

Answer 1

Answer:

• Nature-real and inverted
• Size-7cm
• Position - beyond centre of curvature

Explanation:

20-u = - 15

Therefore u = - 35

M= - (-35)/20

Therefore m=35/20......eq1

Also m= h2/h1

Or m =h2/4.......eq2

Comparing eq1 and eq2 we get

h2/4=35/20

Therefore h2= 7 cm