1.

Fill in the blanks(a) Water is optically........... than air.(b) Air is optically................ than glass.(c) When a ray of light travels from water to air, it bends............... the normal.(d) When a ray of light travels from air to glass, it bends............... the normal.(e) When white light passes through a prism, it................ (f) The splitting of white light into its constituent colors is called..............(g) A..............mirror is obtained on silvering the outer surface of a part of a hollow glass sphere.(h) Radius of curvature of a spherical mirror is............... its focal length.(i) The angle of incidence for a ray of light passing through the center of curvature of a spherical mirror is............(j) A convex mirror always forms a virtual image.(k) A........... ..mirror forms a virtual image for an object placed........... 

Answer»

(a) Water is optically denser than air.

(b) Air is optically rarer than glass.

(c) When a ray of light travels from water to air, it bends away from the normal.

(d) When a ray of light travels from air to glass, it bends towards the normal.

(e) When white light passes through a prism, it disperses

(f) The splitting of white light into its constituent colours is called dispersion.

(g) A concave mirror is obtained on silvering the outer surface of a part of a hollow glass sphere.

(h) Radius of curvature of a spherical mirror is two times its focal length.

(i) The angle of incidence for a ray of light passing through the center of curvature of a spherical mirror is 0°

(j) A convex mirror always forms a virtual image.

(k) A concave mirror forms a virtual image for an object placed between pole and focus.


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