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 .

 (iv)  Reflectors of head lights in cars.

7.       

7.8.

\

 (i) Give any 3 properties of the image formed on the mirror.

(ii)

(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.