Question

any
19. Read the following and ans
Sudha finds out that the sharp image of the window pane of her science laboratory is
formed at a distance of 15 cm from the lens. She tries to focus the building visible to her
outside window pane without disturbing the lens.
(i) In which direction will she move the screen to obtain sharp image of the building?
(a) Away from the lens (c) cannot be said
fb) Towards the lens
(d) none of these
(ii) What is the approximate focal length of this lens?
(a) 10cm
(c) 20cm
b) 15cm
(d) 30cm
(iii) The type of lens used is :
(a) Convex
(c) cylindrical​

Answer 1

Answer:

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