Question

An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.(All India - 2017)

Answer 1

nature of image is virtula and erect

size of image is small size

position of image is between optical centre and focus f1

Answer 2

Dear Student,

◆ Answer -

So the image formed is -

- virtual

- erect

- diminished

- 10 cm on same side of object

● Explanation -

# Given -

u = -30 cm

f = -15 cm

# Solution -

Applying mirror formula,

1/f = 1/v - 1/u

1/-15 = 1/v - 1/-30

1/v = -1/15 - 1/30

1/v = -1/10

v = -10 cm

So the image formed is -

- virtual

- erect

- diminished

- 10 cm on same side of object

Thanks dear. Hope this helps you..