1) What do you understand by the term "light energy "?
2) What do you understand by the term rectilinear propagation of light ?
3) Give two everyday phenomena which suggest that light travels in straight lines.
4) What do you understand by the following term? Give three examples In which case.
a) Transparent medium.
b) Translucent medium.
c) Opaque body.
5) Define the following terms regarding reflection of light:
a) Mirror
b) Incident ray.
c) Point of incidence.
d) Reflected ray.
e) Normal
f) Angle of incidence.
g) Angle of reflection.
h) Glance angle of incidence.
i) Glance angle of reflection.
5) State two laws of reflection.
6) State 5 characteristics of the image formed in the plane mirror.
7) What do you understand by the term reflection of light?
8) Define by giving an example, drawing a diagram and one use of the following:
a) Regular reflection.
b) Irregular(Diffused) reflection.
9) Define the following terms with reference to reflection of light:
a) Image
b) Real image.
c) Virtual image.
10) Draw a diagram to show reflection of rar of light using a plane mirror. In the diagram label the incident ray, the reflected ray, the normal, the angle of incidence and the angle of reflection.
11) By drawing two ray diagrams,
12) a) Diagram shows two plane mirrors inclined at an angle of 90°.
By drawing two ray diagram, Show how an eye sees the images.
b) Which of the images formed above is brightest and why?
13) An insect is sitting in front of a plane mirror at a distance of 1m from it.
a) Where is the image of the insect form formed?
b) What is the distance between the inset and the image ?
14) Name a mirror which always produces an erect and virtual image of the same size as the object.
15) Distinguish between the real and the virtual image.
16) An object is placed at distance of 2cm from a plane mirror. If the object is moved 1cm towards mirror, what will be new distance between the object and the image?
17) Define the following terms:
a) Concave mirror.
b) Convex mirror.
18) What do you understand by the following terms with respect to a spherical mirror?
i) Pole
ii) Centre of curvature.
iii) Principal axis.
iv) Principal focus.
v) Focal length
vi) Eadius of curvature.
vii) Aperture
19)a) In the diagram,
shown is a concave mirror M. A is a point on the principalnaxis. If an object is kept at A, the image is formed on itself. Draw the image in the diagram.
b) Is this image real or virtual ?
c) Measure the distance PA.
d) What is the distance PA called ?
e) Mark a point B on the principal axis at which. If a point source of light is kept, the ray travel parallel to principal axis after reflection from M. What is the point called ?
20) State the relation between the focal length and the radius of curvature.
21) a) An object O is placed at point A,
in front of a concave mirror. Show by two ray diagram, how the image is formed.
b) State four characteristics of the image.
22) a) What is a real image ?
b) Is real image always inverted ?
c) What type of mirror is used to obtain a real image ?
d) Does the mirror named by you always form real image for all locations of the object ?
23) An object OA is placed on the principal axis of a concave mirror as shown in diagram.
Complete the diagram to show the formation of the image.
24)a) Name a mirror which always forms virtual, erect image of the same size as the object.
b) Name a mirror which sometimes forms a real image and sometimes a virtual image for different locations of the object.
c) Name a mirror which always forms a virtual, erect and diminished image.
25) Compare the properties of an image formed in case of a convex mirror and a concave mirror when the object is placed between the pole and the infinity.
26) By drawing two rays, show the formation of an image in the diagram given below,
for the object AB. State the size, position and the nature of the image formed.
27) You are provided with a plane mirror, convex mirror and a concave mirror. How will you distinguish between them without touching the mirrors ?
27) Why do drivers prefer a convex mirror as a rear view mirror ? illustrate your answer with a diagram.
28) Give two uses each of:
a) Plane mirror
b) Concave mirror
c) Convex mirror
59) A ray of light is incident on a plane mirror at an angle of 20°. If the mirror is rotated through an angle of 45°, find
a) Angle between the incident ray and the reflected ray before turning.
b) Angle between the incident ray and the reflected ray when the mirror is turned .
c) Angle through which the reflected ray turns.
d) What conclusion do you draw between the angle through which the mirror turns to the angle through which the reflected turns?
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