Advertisements
Advertisements
Question
The figure given alongside shows the image of a clock as seen in a plane mirror. The correct time is:

Options
2.25
2.35
6.45
9.25
Advertisements
Solution
9.25
Explanation:
The image shows a mirror reflection displaying 2:35, which means the left and right sides are reversed. To find the actual time, subtract the reflected time from 11:60 (which represents 12:00). Subtracting 2:35 from 11:60 gives 9:25.
APPEARS IN
RELATED QUESTIONS
What is lateral inversion? Explain by giving a suitable example.
An extended object in the form of an arrow pointing upward has been placed in front of a plane mirror. Draw a labelled ray-diagram to show the formation of its image.
The angle of reflection is equal to the angle of incidence:
(a) always
(b) sometimes
(c) under special conditions
(d) never
State two effects caused by the refraction of light.
Fill in the following blank with suitable word:
Light travelling along a normal is ...............refracted.
A ray of light travelling in air is incident on a rectangular glass block and emerges out into the air from the opposite face. Draw a labelled ray diagram to show the completer path of this ray of light. Mark the two points where the refraction of light takes place. What can you say about the final direction of ray of light?
Light travelling from a denser medium to a rarer medium along a normal to the boundary:
(a) is refracted towards the normal
(b) is refracted away from the normal
(c) goes along the boundary
(d) is not refracted
A ray of light when passes from glass to air, bends towards the normal.
Draw suitable diagrams to illustrate how a beam of light incident parallel to the principal axis is reflected by:
(a) a concave mirror, and (b) a convex mirror
A real image is formed by the light rays after reflection or refraction when they:
- actually meet or intersect with each other.
- actually converge at a point.
- appear to meet when they are produced in the backward direction.
- appear to diverge from a point.
Which of the above statements are correct?
Identify the wrong figure from the following.
Write scientific reason.
The sun appears on the western horizon for some time after sunset.
Write scientific reason.
The bottom of a pond appears raised.
The ratio of the sine of the angle of incidence to the sine of ______ is constant.
Light is refracted or bent while going from one medium to another because of its ______ changes.
Mirage is an example of refraction and the total internal reflection of light.
Twinkling of stars and Mirage are the two phenomena occurring due to refraction.
Match the following:
| Column I | Column II | ||
| 1. | r > 90 | a. | Light gazes at the surface of separation between the two modes. |
| 2. | r = 90 | b. | No refraction. |
| 3. | r < 90 | c. | Refracted ray away from the normal |
The ray that enters the second medium after crossing the boundary is called the:
