SECTION A
1.
For what position
of an object, a concave mirror forms an enlarged virtual image?
2.
An object is placed in front of a
mirror, image of this object is
formed on a screen placed 50 cm from the
mirror ,if height of the image is two times the object, calculate the object
distance.
3.
Name the defect of
vision in a person whose near point is more than 25 cm away.
4. Give reason for the following.
(i) Red colour is used in Danger
signals.
(ii) Sun and its surrounding sky
appear red.
5. Write lens formula.
Use lens
formula to find the distance ‘x’ in the given diagram.
6.
Name the Mirrors used for the following
(i) Used as shaving Mirror.
(ii) Used as reflectors in street lights.
(iii) Used by dentist .
7.
7.8.
\
(i) Give any 3 properties of the image formed
on the mirror.
(iii)
8. Explain the function of the following parts in human eye.
(i)
Retina
(ii) Pupil
(v)
Ciliary muscles
9. The following diagram shows a defect of eye .
(i)
Identify the defect
(ii) What are its causes?
(iii) Draw a diagram showing its
correction?
(iv) Name the type of lens used for
its correction.
Section B
10. The diagram shows the dispersion of white light by a glass prism.
Why does dispersion occur when white
light enters the glass?
(A)The frequency of red light
decreases more than that of violet light.
(B) The frequency of violet light
decreases more than that of red light.
(C) The speed of red light decreases
more than that of violet light.
(D) The speed of violet light
decreases more than that of red light.
11.
12.
13.
14.
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thanks