Question

Fill in the blanks

(1) The ________ at the point of incidence is called the normal.
(2) __________ is a light sensitive screen of the eye
(3) When two mirrors are kept parallel to each other the number of images is _____________.
(4) Kaleidoscope works on the principle of __________.
(5) The splitting of white light into its constituent colours is called ________.
(6) The coloured part of eye is _________.
(7) The ________muscles alter the ________ of the eye lens.
(8) The normal value for a ________ is approximately 25cm.
(9) Droplets of water split sunlight to form a spectrum known as ______.
(10) ________ can be corrected by using a concave lens of suitable focal length.
(11) Refraction occurs because the ________ of light is different in different medium.
(12) When white light passes through a prism, it is __________.
(13) In a Kaleidoscope, the mirrors make an angle of _______ with each other.
(14) The English Braille system uses _________ dots.
(15) Lateral displacement takes place due to refraction in a ________.
(16)The image formed by a plane mirror shows the phenomenon of
inversion.
(17) Perpendicular at the point of incidence is_ _.
(18) Splitting up of light into its color is known as_ _ of light.
(19) Part of retina which is devoid of light sensitive cells .
(20) During near vision,ciliary muscles , while during distant vision, they expand.
(21) lens is present in the eyes.
(22) protect the inner structure of the eyes.
(23) The day birds like Kite, Eagle have more_ &fewer_ .
(24) Reflection of light by a smooth polished surface is reflection.
(25)The nerves connects the eyes to brain.




Choose the correct answer:
1.
Braille System was developed in


a)
1891
c)
1791
b)
1888
d)
1821
2.
a)
The image formed by a plane mirror is
Always real

c)

Always virtual
b)
Sometimes real & sometimes Virtual depending upon the distance of object from the mirror
.
d)
Real but diminished

The no. of multiple images formed by two plane mirrors, if theangle between them is72˚
4 c)5
6 d)7

A person is standing 5m away from a plane mirror. What will be the distance between him & theimage?
5m c) 0m
10m d) 15m
Name the following:
The most popular resource for visually challenged person to read& write.
The ray which strikes any surface.
Light sensitive cells in the eye.
A smooth, shining surface, which rebounds the light back in the same or different direction.
The invisible energy which causes in use the sensation of vision.
The ray of light which travels towards a mirror.
A line which is drawn at right angles to the mirror surface at the point of incidence.
Name one type of mirror which always form virtual image.
What type of image is formed on the cinema screen?
Which cells on the retina respond to the intensity of light.
The part of the eye which preserves its shape and protects it from externa linjuries.
The phenomenon due to which we can judge depth.
The most sensitive part of the retina.

Choose the correct options from brackets

The scientist who discovered that white light is composed of 7 colours. [ Louis Braille, Dalton, Issac Newton]
can be donated after death, to enable a blind person see. [ optic nerve, cornea,iris]
The part of the retina which is insensitive to light. [ cornea, yellow spot, blindspot]
Focal length of the eye lens can be adjusted by the actionof [ choroid, ciliary muscles, opticnerve]
Formation of multiple images in the eyes is avoided by the action of [iris, pupil,choroid]
The colour of a person‟s eye is determined by his [pupil, iris,retina]
Electric pulses from retina to brain is conveyed through [ciliary muscles, optic nerves, pupil]

Answer 1

Answer:

2 retina

6 iris 7 ciliary muscles

Explanation:

8 young adult 10 hypermetropia 14 63