MEDIUM
10th CBSE
IMPORTANT
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An object is placed between the focus and a device and the image formed is enlarged and on the same side as that of the object. Identify the device if the image formed is virtual and erect. (Convex lens/Convex mirror)

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Important Questions on Light - Reflection and Refraction

MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>NCERT EXEMPLAR PROBLEMS>Q 20
Identify the device used in the following case, when the image formed is virtual and erect. 
Object is placed between infinity and device, image formed is diminished and between focus and optical centre on the same side as that of the object.
MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>NCERT EXEMPLAR PROBLEMS>Q 20

Identify the device used as a spherical mirror or lens in the following case.
Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.

(Choose from Convex mirror, Concave mirror, Convex lens, Concave lens)

HARD
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>NCERT EXEMPLAR PROBLEMS>Q 21
Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to itself? Explain using a diagram. 
MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>NCERT EXEMPLAR PROBLEMS>Q 22
A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine. Support your answer with reason. 
MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>NCERT EXEMPLAR PROBLEMS>Q 23
How is the refractive index of a medium related to the speed of light? Obtain an expression for refractive index of a medium with respect to another in terms of speed of light in these two media? 
 
MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>NCERT EXEMPLAR PROBLEMS>Q 24
Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5 Find out the absolute refractive index of diamond.
HARD
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>NCERT EXEMPLAR PROBLEMS>Q 25
A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images? 
MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>NCERT EXEMPLAR PROBLEMS>Q 26
Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus the building visible to her outside the window instead of the window pane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building? What is the approximate focal length of this lens?