SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

A needle placed 45 cm from lens forms an image on a screen placed 90 cm on the other side of lens, focal length and type of lens is

(a)

10 cm, convex lens

(b)

30 cm, convert lens

(c)

30 cm, concave lens

(d)

10 cm, concave lens


Question ID - 100172 :-

A needle placed 45 cm from lens forms an image on a screen placed 90 cm on the other side of lens, focal length and type of lens is

(a)

10 cm, convex lens

(b)

30 cm, convert lens

(c)

30 cm, concave lens

(d)

10 cm, concave lens

1 Answer
5876 Votes
3537

Answer Key : (b) -

30 cm, convert lens



Next Question :

Two pendulums each of length  are initially situated as shown in fig. The first pendulum is released and strikes the second. Assume that the collision is completely inelastic and neglect the mass of the string and any frictional effects. How high does the centre of mass rise after the collision?

a)

b)

c)

d)


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