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1 dioptre is the power of a lens whose focal length is

(a)

2 m

(b)

1 m

(c)

3 m

(d)

1.5 m


Question ID - 101116 :-

1 dioptre is the power of a lens whose focal length is

(a)

2 m

(b)

1 m

(c)

3 m

(d)

1.5 m

1 Answer
5876 Votes
3537

Answer Key : (b) -

1 m



Next Question :

The centre of mass of a body is a point at which the whole mass of the body is supposed to be concentrated. If the body consists of two particles of masses  with  and as their position vectors, then the position vector of the centre of mass is

Similarly, velocity of centre of mass of two particles moving with velocities  and

is

, and

Acceleration of centre of mass of two particles having acceleration and is

For an isolated system, where no external force acts,  and  = constant.

Read the above paragraph and answer the following questions:

Two bodies of masses 2 kg and 4 kg are moving towards each other with equal velocity . The velocity of centre of mass is

a)

b)

c)

d)


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