Question

The image of a candle flame at a distance of 45 cm from a spherical lens is formed on a screen placed at a distance of 90 cm from the lens. The type of lens, its focal length are

2 points

a) Concave, -30 cm

b) Concave, +30 cm

c) Convex, +90 cm

d) Convex, +30 cm

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Answer 1

Answer:

d) convex, +30 cm

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