Question

Please help............... ​

Answer 1

Answer:

1)20 cm mirror will produce more convergent beam because the focal length is higher than the first one so they will produce more convergent beam

Answer 2

Answer:

Hi Antara,

1.) Focal length of any lens is the point where light converges. So, if focal length is more then the lens has converged the light to a larger distance that is it has converged less. Whereas, if the focal length is less then the light is converged at a smaller distance that is converged more. So, we can affirm that lens of 20 cm should be used to converge light to a larger extent.

2.) Here,

Question Bank Solutions

17965

Object distance, u = - 20 cm

We know, m = -

-3 =

-() 20

-60cm

The screen is placed in front of the mirrors at a distance of 60 cm fron the pole of the mirror.

Thus, the screen is placed 40 cm (= 60 cm - 20 cm) away from the object.

Hope it helps you

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