Some examples from this set of practice questions
1.
What are conditions of total internal reflection?
Answer: Ans. - (i) Angle of incidence must be greater than critical angle. (ii) Light ray should enter from denser to rarer medium.
2.
When the value of refractive index is less than one and more than one?
Answer: Ans. Refractive index of rarer medium with respect to denser medium is less than one and that of denser medium with respect to rarer medium is more than one.
3.
If a concave mirror and convex lens are dipped in water. What will be the changes in their focal length ?
Answer: Ans. The focal length of concave mirror will remain unchanged and that of convex lens will increase.
4.
Define magnification of a spherical mirror.
Answer: Ans. The ratio of size of image to size of object is known as magnification. \" m = h\'/h = v/u. \"
5.
Concave mirror is used for shaving, why?
Answer: Ans. When the object is within the focal length of the concave mirror then virtual, erect and magnified image is formed. This is the reason that concave mirror is used for shaving.
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