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10th CBSE
IMPORTANT
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If R is the radius of curvature of a mirror and f is its focal length then

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Important Questions on Reflection and Refraction

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10th CBSE
IMPORTANT
Modern's ABC+ Of Science Physics>Chapter 4 - Reflection and Refraction>PRACTICE QUESTIONS>Q 6
The image formed by a concave mirror is
EASY
10th CBSE
IMPORTANT
Modern's ABC+ Of Science Physics>Chapter 4 - Reflection and Refraction>PRACTICE QUESTIONS>Q 7
A parallel beam of light after reflection from a mirror converges at a point. The mirror is:
MEDIUM
10th CBSE
IMPORTANT
Modern's ABC+ Of Science Physics>Chapter 4 - Reflection and Refraction>PRACTICE QUESTIONS>Q 8
A concave mirror of focal length 10 cm is dipped in water. The focal length of the concave mirror in water is:
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10th CBSE
IMPORTANT
Modern's ABC+ Of Science Physics>Chapter 4 - Reflection and Refraction>PRACTICE QUESTIONS>Q 9
What is the focal plane of a concave mirror?
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10th CBSE
IMPORTANT
Modern's ABC+ Of Science Physics>Chapter 4 - Reflection and Refraction>PRACTICE QUESTIONS>Q 10
To find the focal length of a concave mirror, the four students, Ram, Shamim, Kamla and Ruksana obtained the image of the window grill on a wall. They measured the distances as given below between:
Ram - window grill and the wall only
Shamim - window grill and the mirror only
Kamla - mirror and wall only
Ruksana - window grill and the wall and also between the mirror and the wall
Correct focal length will be obtained by the student -
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10th CBSE
IMPORTANT
Modern's ABC+ Of Science Physics>Chapter 4 - Reflection and Refraction>PRACTICE QUESTIONS>Q 11

Study the following diagram and select the correct statement about the device 'X':

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10th CBSE
IMPORTANT
Modern's ABC+ Of Science Physics>Chapter 4 - Reflection and Refraction>PRACTICE QUESTIONS>Q 12

A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should be measured to get the focal length of mirror?

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MEDIUM
10th CBSE
IMPORTANT
Modern's ABC+ Of Science Physics>Chapter 4 - Reflection and Refraction>PRACTICE QUESTIONS>Q 13
A student obtained a sharp image of the grill of a window on a screen using a convex lens. For better results, the teacher suggested focussing of a distant tree instead of the grill. In what direction should the lens be moved for this purpose?