.2) How do you appreciate the role of molecules in the atmosphere for the blue colour of the
sky? (AS6
)
3) How do you appreciate the working of Ciliary muscles in the eye? (AS 6)
4) Glass is known to be a transparent material. But ground glass is opaque and white in
colour.Why? (AS7
)
5) A light ray falls on one of the faces of a prism at an angle 40o
so that it suffers angle of
minimum deviation of 30o
. Find the angle of prism and angle of refraction at the given
surface.
(Ans:50o
,25o
) (AS7
)
6) The focal length of a lens suggested to a person with Hypermetropia is 100cm. Find the
distance of near point and power of the lens. (Ans: 33.33cm, 1D ) (AS 7
)
Higher Order Thinking Questions
1) Eye is the only organ to visualize the colourful world around us. This is possible due to
accommodation of eye lens. Prepare a six line stanza expressing your wonderful feelings.
(AS 6
)
Multiple choice questions
1) The size of an object as perceived by an eye depends primarily on [ ]
A)actual size of the object B) distance of the object from the eye
C) aperture of the pupil D) size if the image formed on the retina
2) When objects at different distances are seen by the eye which of the following remain
constant?
A) focal length of eye-lens B) object distance from eye-lens [ ]
C) the radii of curvature of eye-lens D) image distance from eye-lens
3) During refraction, ________ will not change. [ ]
A) Wave length B) frequency C) speed of light D) all the above
4) A ray of light falls on one of the lateral surface of an equilateral glass prism placed on the
horizontal surface of a table as shown in fig. 2.For minimum deviation of ray, which of the
following is true? [ ]
A) PQ is horizontal B) QR is horizontal
C) RS is horizontal D) either PQ or RS is horizontal
