Olympiad Test: Light - 2 - Class 7 MCQ

ray 

beam

sunlight

none of these 

ray 

beam

twilight

sunlight 

positive

negative

infinity

none of these 

focal length

principal axis

radius of curvature

diameter of curvature 

1 - B, 2 - C, 3 - A, 4 - E, 5 - D

1 - B, 2 - C, 3 - E, 4 - D, 5 - A

1 - C, 2 - B, 3 - A, 4 - D, 5 - E

1 - E, 2 - C, 3 - B, 4 - A, 5 - D

x + L

x × L

L – x

x/L

3 surfaces

4 surfaces

5 surfaces

6 surfaces 

eye is quicker than the brain

the optical cortex can see through the rapidly moving images.

the eye can focus on very rapidly changing pictures.

eye can separate two images only when the interval of separation between them is one tenth of second. 

at an angle of 45°

at an angle of 60°

perpendicular to each other

parallel to each other 

view objects placed at a higher level from a position at lower level.

magnify extremely small objects into bigger images

observe the distant images such as planets and stars

analyse the spectrum formed by the sunlight