We are given a concave lens of focal length 15 cm. Draw a ray diagram to show
the nature, size and position of the image formed when the object is kept at a
distance of
(a) 30 cm (b) 15 cm (c) 10 cm
from the lens.
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We are given a concave lens of focal length 15 cm. Draw a ray diagram to show
the nature, size and position of the image formed when the object is kept at a
distance of
(a) 30 cm (b) 15 cm (c) 10 cm
from the lens.
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Answer:
Focal length (f ) = -15 cm
Distance of image (v) = -10 cm
1v–1u=1f
1/u = -(1/10) – (1/- 15)
1/u =1/15 – 1/10
1/u = -0.033
u = -30 cm
so the object is placed 30 cm away from the concave lens.