EASY
10th Mizoram Board
IMPORTANT
Earn 100

Find the focal length of a convex mirror whose radius of curvature is 32 cm.

Important Questions on Light - Reflection and Refraction

MEDIUM
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 2
A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 1
A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
MEDIUM
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 2
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in a vacuum is 3×108 ms.
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 3

Find out, from the table, the medium having the highest optical density. Also, find the medium with the lowest optical density. 

Material medium Refractive index Material medium Refractive index
Air 1.0003 Crown glass 1.52
Ice 1.31 Canada Balsam 1.53
Water 1.33 Rock Salt 1.54
Alcohol 1.36 Carbon disulphide 1.63
Kerosene 1.44 Dense flint glass  1.65
Fused Quartz 1.46 Ruby 1.71
Turpentine oil 1.47 Sapphire 1.77
Benzene 1.50 Diamond 2.42
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 4

You are given kerosene, turpentine, and water. In which of these does the light travel fastest? Use the information given in the table.

Material medium Refractive index Material medium Refractive index
Air 1.0003 Crown glass 1.52
Ice 1.31 Canada Balsam 1.53
Water 1.33 Rock Salt 1.54
Alcohol 1.36 Carbon disulphide 1.63
Kerosene 1.44 Dense flint glass  1.65
Fused Quartz 1.46 Ruby 1.71
Turpentine oil 1.47 Sapphire 1.77
Benzene 1.50 Diamond 2.42
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 5
The refractive index of diamond is 2.42. What is the meaning of this statement?
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 1
Define 1 dioptre of power of a lens.
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 10 - Light - Reflection and Refraction>QUESTIONS>Q 2
A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.