Write True or false for each statement :

(a) Water is optically denser than glass.

(b) A ray of light when passes from glass to air, bends towards the normal.

(c) The speed of light is more in glass than in water.

(d) The depth of a pond when seen from above appears to be less.

(e) Light travels at a lower speed in water than in air.

(f) Light travels in the same straight line path while passing through different media.

(g) The angle formed between the normal and the refracted ray is known as the angle of incidence.

(h) At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.

(i) Image is formed by a mirror due to refraction of light.

(j) Rays of light incident parallel to the principal axis pass through the focus after reflection from a concave mirror.

(k) A convex mirror is used as a shaving mirror.

(l) The focal length of a convex mirror is equal to its adius of curvature.

(m) A concave mirror converges the light rays, but a convex mirror diverges them.

(n) A virtual image formed by a spherical mirror is always erect and situated behind the mirror.

Ans. True - (d), (e), (h), (j), (m), (n),

False - (a), (b), (c), (f), (g), (i), (k), (l)

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Solution

(a) Water is optically denser than glass.
Answer. False.
Water is optically denser than air.
(b) A ray of light when passes from glass to air, bends towards the normal.
Answer. False.
(c) The speed of light is more in glass than in water.
Answer. False.
(d) The depth of a pond when seen from above appears to be less.
Answer. True.
(e) Light travels at a lower speed in water than in air.
Answer. True.
(f) Light travels in the same straight line path while passing through different media.
Answer. False.(g) The angle formed between the normal and the refracted ray is known as the angle of incidence.
Answer. False.
(h) At the point of incidence, a line drawn at right angles to the surface, separating the two media, is
called the normal.
Answer. True.
(i) Image is formed by a mirror due to refraction of light.
Answer. False.
(j) Rays of light incident parallel to the principal axis pass through the focus after re ection from a
concave mirror.
Answer. True.
(k) A convex mirror is used as a shaving mirror.
Answer. False.
(l) The focal length of a convex mirror is equal to its radius of curvature.
Answer. False.
(m) A concave mirror converges the light-rays, but a convex mirror diverges them.
Answer. True.
(n) A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
Answer. True.

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Similar questions

Fill in the blanks :

(a) Water is optically ___ than air.

(b) Air is optically ___ than glass.

(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 colours 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 centre of curvature of aspherical mirror is ___

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

(k) A concave mirror forms a virtual image for an object placed ___

Ans. (a) denser (b) rarer (c) away from (d) towards (e) disperses (f) dispersion

(g) concave (h) two times (i) $0^{\circ}$ (j) convex (k) between pole and focus

Fill in the following blanks with suitable words :

(a) Parallel rays of light are reflected by a concave mirror to a point called the ___.

(b) The focal length of a concave mirror is the distance from the ___ to the mirror.

(d) For a convex mirror, parallel rays of light appear to diverge from a point called the___.

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