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Science [1 Mark Questions]

Light. · Tamil Nadu Board STD 8 (Tamil - English Medium). 12 questions.

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[1 Mark Questions]

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12 questions · timed · auto-graded

Question 11 Mark
The angle between incident ray and reflected ray is 60°. What is the value of angle of incidence?
Answer
Image
since angle of incidence = angle of reflection.
So, angle of incidence = 30°.
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Question 31 Mark
Light bends as it passes from one medium to another. What is this phenomenon called?
Answer
Refraction of light.
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Question 71 Mark
What type of image is formed by a concave mirror?
Answer
Real and inverted image. If the object is placed very close to the mirror then the image is virtual and erect.
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Question 81 Mark
What is mirror?
Answer
The mirror is an optical device with a polished surface that reflects the light falling on it.
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Question 91 Mark
What is reflection of light?
Answer
The bouncing back of light when it falls on smooth surface is called reflection.
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Question 111 Mark
Define the refractive index of a medium.
Answer
The amount of refraction of light in a medium is denoted by a term known as the refractive index of the medium, which is the ratio of the speed of light in the air to the speed of light in that particular medium.
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Question 121 Mark
Define focal length.
Answer
The distance between the pole and the principal focus is called the focal length (f) of a spherical mirror.
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[1 Mark Questions] - Science STD 8 Questions - Vidyadip