12th Standard CBSE Syllabus & Materials
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Published on: 27/05/2021
CBSE 12th Standard Physics Subject Wave Optics HOT Questions 2 Mark Questions With Solution 2021
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Questions + Answers key
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1.
In the given figure, for what value of (For prism, \(\mu\)=1.524
2.
When monochromatic light travels from a rarer to a denser medium, explain the following, giving reasons.
(i) Is the frequency of reflected and refracted light same as the frequency of incident light?
(ii) Does the decrease in speed imply a reduction in the energy carried light wave?
3.
An onject AB is kept in front of a concave mirror as shown in the figure.
Complete the ray diagram showing the image formation of the object.
1.
If we observe the figure, then we find that angle of emergence, e = 900. Now applying Snell's law at face AC, we have
\( \frac { \sin { e } }{ \sin { { r }^{ 2 } } } =\mu \Rightarrow \sin { { r }^{ 2 } } =\frac { 1 }{ \mu } \times \sin { { 90 }^{ 0 } } \)
\( \Rightarrow \sin { { r }^{ 2 } } =\frac { 1 }{ 1.524 } \times 1\Rightarrow { r }^{ 2 }={ sin }^{ -1 }(0.656)\ \)
\(Rightarrow { r }_{ 2 }={ 41 }^{ 0 }\)
\(From \ geometry,\)
2.
(i) The frequency of reflected and refracted light remains same as that of incident light because frequency only depends on the source of light.
(ii) Since the frequency remains same, hence there is no reduction in energy.
3.
The ray diagram showing the image formation of the object.
12th Standard CBSE Syllabus & Materials
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