Question

an object of heigh 4 cm is placed before a convex lens of focal length 10 cm on principle axis at a distance of 15 cm find the image distance size of image and write characteristics of image ​

Answer 1

hey

1/f = 1/v + 1/u

1/-10 = 1/v + 1/-15

1/-10 + 1/15 = 1/v

1/v = - 3 + 2/30

1/v = -1/30

v = -30

The image will be formed at 30cm

☆ Characteristics of image :-

Real

Inverted

magnified

Answer 2

1/f =1/v =1/4

1/f +1/4 = 1/v

= 1/10 - 1/15 =1/v

= 3-2/30 =1/v

= 1/30 =1/v

= v = 30cm

= v/u = h1 /4

= _3×4 =h1

= h1 = -12cm