Please solve this Q14: Draw the ray diagram in each case to show the position and nature Of the
image formed when the Object is placed:
(i) at the centre of curvature of a concave mirror
(ii) between the pole P and focus F Of a concave mirror
(iii) in front Of a convex mirror
(iv) at infinity of a convex mirror
(v) at infinity of a concave mirror
Q 15: The refractive indices Of four media A, B, C and D are given in the following
table:
Medium
Refractive Index
1.33
1.50
1.52
2.40
If light, travels from one medium to another, in which case the change in
speed will be (i) minimum, (ii) maximum? Why?
Q 16: Explain with the help of a diagram, why a pencil partly immersed in water
appears to be bent at the Water surface.
Q 17: When a plane mirror is rotated by an angle Of 300, what will be the angle Of
rotation of the reflected ray for the fixed incident ray?
Q 18: With respect to air the refractive index of kerosene is 1.44 and that of diamond
is 2.42. Calculate the refractive index of diamond with respect to kerosene.
Q 19: If an object of height 4 cm is placed at distance of 12 cm from a concave mirror
having focal length 24 cm, find the position, nature and the height of the image
formed. Draw a ray diagram to show the image formation.
Q 20: At what distance the object should be placed so that the image will be formed
at a distance 10cm from a convex mirror? Focal length of the mirror is 20 cm.
CHEMISTRY (Assignment to done in Ruled A4 Sheets)
Chemical reaction and equation
1. On what chemical law, balancing Of chemical equation is based?
2. Identify the compound oxidized in the following reaction:
S (s) + HCI (g) + C12 (g)
3. Give an example of photochemical reaction.
4. Name the reaction which forms insoluble salts.
Name the product obtained and type Of reaction given below:
5.
NaS04 + BaClz-m
6. Give the chemical formula of rust.
7. Why potato chips manufacturers fill the packet Of chips with nitrogen gas?
