Ray Optics and Optical Test

Result

Ray Optics and Optical Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

If a ray of light goes from a rarer medium to a denser medium , will it bend towards the normal or away from it ?

A
bends away from the normal

B
bends towards the normal

C
goes undeviated

D
is reflected back

Solution

Refraction is the bending of light rays after entering a medium where its speed is different. Due to refraction of light, when a ray of light passes from a rarer medium to a denser medium, bends towards the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media. Hence, when a ray of light from air enters a denser medium, it bends towards the normal.
Question 2
1 / -0

What causes chromatic aberration?

A
Marginal rays

B
Central rays

C
Difference in radii of curvature of its surfaces

D
Variation of focal length of lens with colour

Solution

Chromatic aberration occurs when a lens is either unable to bring all wavelengths of color to the same focal plane and/or wavelengths of color are focused at different positions in the focal plane.
Question 3
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In which of the following the final image is erect?

A
Simple microscope

B
Compound microscope

C
Astronomical telescope

D
none of these

Solution

Only in simple microscope the image formed is erect, while it is inverted in compound microscope and astronomical telescope.
Question 4
1 / -0

The rays of different colours fail to converge at a point after going through a converging lens. This defect is called :

A
spherical aberration

B
distortion

C
coma

D
chromatic aberration

Solution

By definition, chromatic aberration is the inability of a converging lens to converge rays of different colour at a point after passing through it.
Question 5
1 / -0

Which of the following would you prefer to use while reading small letters found in a dictionary ?

A
A concave mirror

B
A concave lens

C
A convex mirror

D
A convex lens

Solution

Convex lens can form an erect, virtual and enlarged image when the object is positioned between its pole and focus.
Question 6
1 / -0

The distance between the focus and the pole of the mirror is called :

A
Focal length

B
Radius of curvature

C
Principal axis

D
Diameter of curvature

Solution

The distance between the focus and the pole of the mirror is called focal length.
Question 7
1 / -0

Two identical prism PQR and P' Q' R' are given. White light is passed through PQR as shown in fig.
Which of the following position of P' Q' R' will again yield white light ?

A

B

C

D
None of these

Solution

$Answer:-$ B option
Question 8
1 / -0

The phenomenon of light bending due to change of medium is called:

A
Reflection

B
Refraction

C
Dispersion

D
Total internal reflection

Solution

When light enters from one medium to another, its speed and direction changes, and hence the light seems to be bending towards or away from the normal. This phenomenon is called refraction of light.
Question 9
1 / -0

The phenomenon of light passing through the object is called :

A
Reflection

B
Refraction

C
Dispersion

D
Total internal reflection

Solution

The phenomena when light passes through the object (a medium) is known as refraction. Refraction is defined as the bending of light ray when it passes from one medium to another.
Question 10
1 / -0

Fill in the blanks:
The phenomenon of change in the _____of light when it passes from one transparent medium to another is refraction.

A
speed

B
direction

C
both A & B

D
None of the above

Solution

The phenomenon of change in the path of light when it passes from one transparent medium to another is refraction. This change in path is due to the change in the speed of light in different media.