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प्रश्न
In the following diagram, the correctly marked angles are
(A) All
(B) Only ∠i and ∠A
(C) ∠i, ∠r and ∠A
(D) ∠i, ∠A and ∠D
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उत्तर
Angle i by conventions represents the angle of incidence which is formed between the incident ray and the normal. From the given figure it is clear that angle i is correctly marked.
Angle r by convention represents angle of refraction which is formed between the refracted ray and the normal. From the given figure it is clear that angle r is correctly marked.
Angle e by convention represents angle of emergent which is formed between the emergent ray and the normal. But in the given figure it is shown between the emergent ray and the incident ray. Therefore, it is incorrectly marked.
Angle D by conventions represents the angle of deviation which is formed between the emergent ray and the incident ray. But in the given figure it is shown between the emergent ray and the normal. Therefore, it is incorrectly marked.
Angle A represents angle of prism and it is correctly marked.
Hence, the correct answer is option (C).
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संबंधित प्रश्न
A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram.
Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE.
(i) Write the name and cause of the phenomenon observed.
(ii) Where else in nature is this phenomenon observed?
(iii) Based on this observation, state the conclusion which can be drawn about the constituents of white light.
After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r) angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are :
(A) ∠i and ∠r
(B) ∠i and ∠e
(C) ∠i, ∠e and ∠D
(D) ∠i, ∠r and ∠e
Fill in the blank with suitable word:
When a ray of light enters a prism, it bends ................ the normal ; as it leaves the prism, it bends ................. the normal.
What acts as tiny prisms in the formation of a rainbow?
The colour of white light which is deviated the maximum on passing through the glass prism is:
(a) blue
(b) indigo
(c) red
(d) orange
The seven colours in the spectrum of sunlight in order, are represented as :
Which is optically denser: water or air? Give reason
You are given a disc divided into seven sectors with colours violet, indigo, blue, green, yellow, orange and red in them. What would be its colour when it is rotated rapidly?
Match the Columns:
| Column ‘A’ | Column ‘B’ |
| The wavelength of red light | (a) 600 nm |
| (b) 700 nm | |
| (c) 500 nm |
When sunlight passes through water droplets in the atmosphere it gets dispersed into its constituent colours forming a rainbow. A similar phenomenon is observed when white light passes through a prism.
Which colour will show the maximum angle of deviation and which colour will show the minimum angle of deviation?
