Question 1 :
The impression of the image formed on the retina of the human eye remains for about:

Question 4 :
Mark&#160;the correct statement:<br/>a. Blind&#160;spot position varies between the left eye and the right eye.<br/>b. For&#160;both the eyes blind spot is not exactly in the same place.<br/>c. Octopus&#160;do not have the Blind spot.

Question 6 :
There is a pattern observed in the number of sum spots appearing every year called as

Question 7 :
Plane mirrors are arranged parallel to each other to get :

Question 11 :
Two plane mirrors are arranged parallel to each other to get :<br/>

Question 14 :
The least distance of distinct vision for a normal person is:

Question 16 :
A ray of light after passing through a medium were spread up into different colours. The phenomenon is called :

Question 17 :
Two plane mirrors are set at right angle and a flower is placed in between the mirrors. The number of images of the flower which will be seen is:

Question 20 :
A&#160;tube containing two or more plane mirrors, inclined at certain angles to each&#160;other, is called a ________. Fill in the blanks.<br/>

Question 21 :
If two mirrors are kept at 45 to each other and abody is placed in the middle then total numberof images formed is :

Question 22 :
Name the part of the eye which gives colour to the eyes.<br>

Question 23 :
When two mirrors are kept parallel to each other, number of images of an object:

Question 25 :
State whether true or false:<br/>The final image formed using a periscope is not bright due to successive reflections.

Question 34 :
Kaleidoscope&#160; is based on the principle of ______ of plane&#160;mirrors.&#160;Fill in the blank.<br/>

Question 35 :
Clouds are white because of light scattering off of water droplets.

Question 36 :
Match the following<br><table class="wysiwyg-table"><tbody><tr><td></td><td>List I</td><td></td><td>List II</td></tr><tr><td>1</td><td>Aqueous humour</td><td>a</td><td>Forms inverted image on the retina</td></tr><tr><td>2</td><td>Vitreous humour</td><td>b</td><td>Spherical</td></tr><tr><td>3</td><td>Eyeball</td><td>c</td><td>Present between lens and retina</td></tr><tr><td>4</td><td>Crystalline lens</td><td>d</td><td>Present between lens and cornea</td></tr></tbody></table>

Question 39 :
A man of height 170 cm wants to see his complete image in the mirror (while standing) His eyes is at a height of 160 cm from the ground

Question 40 :
When light enters the eyes, most of the&#160;refraction occurs at the :