45.The horizontal and vertical
components of the earth
magnetic feild are equal in
magnitude at a certain place
on the earth surface. the dip
angle of this place will be
O 30 degree
0 45 degree
O O degree
O 90 degree
Answers
Answer:
45An object is placed at distance of 10cm from a concave mirror of focal length
20cm.
(a). Draw a ray diagram for the formation of the image.
(b). Calculate the image distance.
(c). State two characteristics of the image formed.
2. An object is kept at a distance of 5cm in front of a convex mirror of focal length
10cm. Calculate the position and magnification of the image and state its
nature.
3. An object is placed 15cm from (a) a converging mirror and (b) a diverging
mirror, of radius of curvature 20cm. Calculate the image position and
magnification in each case.
4. The speed of light in air is 3×108 m/s. In medium x its speed is 2×108 m/s and in
medium y the speed of light is 2.5×108 m/s. Calculate:
(a) airnx (b) airny (c) xny (d) ynx
5. For the same angle of incidence in media A,B and C, the angles of refraction
are 200
, 300
and 400
respectively. In which medium will the velocity of light and
refractive index be maximum? Give reason in support of your answer.