1.
The
image of a candle flame formed by a lens is obtained on a screen placed on the
other side of the lens. If the image is three times the size of the flame and
the distance between lens and image is 80cm. At what distance should the candle
be placed from the lens? What is the nature of the image at a distance 80cm and
the lens?
2.
What
does the negative sign in the value of magnification produced by a mirror
indicates about an image?
3.
Size
of image of an object by a mirror having a focal length of 20cm is observed to
be reduced to one-third of its size. At what distance the object has been
placed from the mirror? What is the nature of the image and the mirror?
4.
Define
power of a lens. What is its unit? One student uses a lens of focal length 50cm
and another -50cm. what is the nature of the lens and its power used by each of
them?
5.
State
snell’s law of refraction. Express refractive index of a medium as a
mathematical formula.
6.
An
object 4cm in size, is placed at 25cm in front of concave mirror of focal
length 15cm. At what distance from the mirror should a screen be placed in order
to obtain a sharp image? Find the nature and size of the object?
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