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Functions of Different Organs in the Human Eye

Fill in the b...

Question

Fill in the blanks.

(a) Angle of incidence = _____.

(b) The incident ray, the reflected ray and the normal lie in same .

(c) The image formed by a plane mirror is at a distance behind the mirror as_.

(d) The image formed by a plane mirror is erect and .

(e) We are able to see the objects around us due to ____ reflection.

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Solution

(a) Angle of incidence = angle of reflection.

(b) The incident ray, the reflected ray and the normal lie in same plane.

(c) The image formed by a plane mirror is at a distance behind the mirror as the object is in front of it.

(d) The image formed by a plane mirror is erect and virtual.

(e) We are able to see the objects around us due to irregular reflection.

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Fill in the blanks.

(a) The incident ray, the normal and the reflected ray are all in the same ………… .

(b) Reflection from a rough surface is called ………… reflection.

(c) In a periscope, we see ………… reflection of an object.

(d) In a plane mirror, the image is ………… inverted.

Q. Two plane mirror A and B are oriented perpendicular to each other. A light ray incident at angle

θ

on mirror A is also reflected by the mirror B. If the reflected ray from mirror B is parallel to the incident ray on A, such that the ray reflected from the first mirror as the same angle of incidence on the second mirror then find the value of

θ

Q. State whether the following statements are true or false. Rewrite the false statements correctly.
(a) The laws of reflection hold good only for plane mirrors and not for spherical mirrors.
(b) The radius of curvature is double the focal length of a concave mirror.
(c) A ray passing through the focus cuts through the principal axis of a concave mirror after reflection.
(d) When an object is placed between a concave mirror and its focus, the image formed is virtual, erect and larger than the object.
(e) The image formed on a cinema screen is virtual.
(f) A convex mirror is used by stage artists.
(g) A convex mirror always gives real images.
(h) A pinhole camera gives a real image.
(i) A convex surface bulges inwards.
(j) Incident rays parallel to the principal axis of a curved mirror pass through the focus after reflection.
(k) A concave mirror always forms a real image.
(l) There can be many reflected rays for a single incident ray falling on a reflecting surface.

Q. Assertion: The image of a virtual object due to a plane mirror is real.
Reason :.If the rays seem to be converging at a point behind a plane mirror, they are reflected and they actually meet in front of the mirror.

Q. A plane mirror is inclined at

40^{o}

to the floor. An incident ray parallel to the floor strikes the mirror and a reflected ray is formed. What is the angle of reflection?

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