Which one of the following figures correctly shows the path of a ray of light through a glass prism:?
CONCEPT:
- Refraction through a prism : It is the bending of light when it goes from one medium to another.
- When a ray of light passes through a glass prism, refraction of light occurs both, when it enters the prism as well as when it leaves the prism.
- Prism : It is a wedge-shaped transparent body that causes incident light to be separated by color upon exiting.
- Since "white" light is really a superposition of different wavelengths, the prism, therefore, has the effect of angularly separating the incident light by color.
Formula:
⇒ Angle of prism (A) = r 1 + r 2
where r 1 = Angle of refraction at phase one, r 2 = Angle of refraction at phase two.
EXPLANATION :
- When a ray of light passes through a prism, it undergoes refraction two times .
- The first time when a ray of light passes from rarer to the denser medium of glass , it bends towards normal which is towards the base of the prism.
- The second time the ray of light passed from denser to rarer medium, i.e., glass to air, and it bends away from the normal , i.e., towards the base of the prism and it is happening only in the first case. Therefore option 1 is correct.
Similar Questions
Which one of the following statements is not correct for light rays?
Match list one with list two and select the correct answers using the code given below the lists:
List one (Disease)
List two (Remedy)
A
Hypermetropia
1
concave lens
B
Presbyopia
2
bifocal lens
C
Myopia
3
Surgery
D
Cataract
4
Convex lens
A lens has a power of +2.0 Dioptre, Which one of the following statements about the lens is true?
Mirage is an illustration of
Twinkling of stars is due to
Name the scientist who first used a glass prism to obtain the spectrum of sunlight
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Which one of the following is the natural phenomena based on which a simple periscope works?
A rainbow is produced due to which one of the following phenomenon?
Consider the following statements about a microscope and a telescope:
1. Both the eyepiece and the objective of a microscope are convex lenses.
2. The focal length of the objective of a telescope is larger than the focal length of its eyepiece.
3. The magnification of a telescope increases with the increase in focal length of its objective.
4. The magnification of a microscope increases with the increase in focal length of its objective.
Which of the statements given above are correct?
Important Questions from Refraction and Reflection
Which one of the following statements is not correct for light rays?
A convex lens of focal length f will form a magnified real image of an object, if the object is placed.
A ray of light travelling in the direction \(\frac{1}{2} (\hat i + \sqrt 3 \hat j)\) is incident on a plane mirror. After reflection it travels along the direction \(\frac{1}{2} (\hat i - \sqrt 3 \hat j)\) The angle of incidence is:
Match list one with list two and select the correct answers using the code given below the lists:
List one (Disease)
List two (Remedy)
A
Hypermetropia
1
concave lens
B
Presbyopia
2
bifocal lens
C
Myopia
3
Surgery
D
Cataract
4
Convex lens
Twinkling of stars is due to atmospheric
