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Apparent Depth

While moving ...

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While moving a pic is being screened , a boy introduced a glass slab of thickness 3cm & refractive index 1.5 b/w the projector & the screen . in order to have a clear pic on the screen , the screen shoud be moved through a distance of?? A. 1cm away B. 1cm nearer C. 2cm away D. 3cm away

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Q. While a moving picture is being screened, a boy introduced a glass slab thickness

3 c m

and refractive index

1.5

between the projector and the screen. In order to have a clear picture on the screen, the screen show to be moved through a distance of :

Q. A lens form a sharp image on a screen. On inserting a parallel-sides slab of glass between the lens and the screen it is found necessary to move the screen a distance

d

away from the lens in order for the image to be again sharply focused. If the refractive index of glass relative to air is

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2 c m \times 2 c m

Slide on a screen 5 meter away from the lens. Find
(i) The size of the picture on the screen and
(ii)ratio of illuminations of the slide and of the picture on the screen.

Q. Upon inserting a parallel-sided slab of glass between the lens and the screen, it was found necessary to move the screen a distance d away from the lens in order for the image to be again sharply focussed. If the refractive index of glass relative to air is

μ

then the thickness of the slab is:

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from the screen. It is found that the screen has to be moved

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