Physics · Class 10 CBSE
A student stands 3 m in front of a plane mirror. Another student says the distance between the student and his image is 3 m. Which statement is correct?
A concave mirror is used as a shaving mirror. Why is it preferred over a plane mirror?
A ray of light passes from air into glass. What happens to the speed of light?
A student shines a laser beam through a rectangular glass slab. The emergent ray is parallel to the incident ray but shifted sideways. What is the reason?
An object is placed beyond the centre of curvature of a concave mirror. The image formed will be:
A person suffering from myopia cannot clearly see:
Which lens is used to correct hypermetropia?
A ray passes through the optical centre of a convex lens. What happens to the ray?
Why do stars appear to twinkle?
A convex lens is used as a magnifying glass. Where should the object be placed?
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Why does a concave mirror produce a magnified image only when the object is placed between the pole and the principal focus?
2 marksDifferentiate between real images and virtual images with one example of each.
2 marksA coin placed at the bottom of a glass of water appears raised. Explain this observation using the concept of refraction.
2 marksWhy are convex mirrors commonly used as rear-view mirrors in vehicles? Give any two reasons.
2 marksA student has difficulty reading the blackboard from the last bench but can read a book comfortably. Identify the defect of vision and explain how it is corrected.
2 marksDraw (or describe) the ray diagram for image formation by a convex lens when the object is placed: - Beyond 2F - At 2F - Between F and 2F State the nature, position, and size of the image in each case.
5 marksExplain myopia and hypermetropia. Include: - Cause of each defect - Ray diagram (if drawing) - Corrective lens used - Everyday situations where each defect causes difficulty
5 marksCase study: A shopkeeper installs a convex mirror at the corner of his shop to monitor customers. Meanwhile, a dentist uses a concave mirror while examining a patient\'s teeth. Answer the following questions: (a) Why is a convex mirror preferred for security purposes?
1 markCase study: A shopkeeper installs a convex mirror at the corner of his shop to monitor customers. Meanwhile, a dentist uses a concave mirror while examining a patient\'s teeth. Answer the following questions: (b) Why does the dentist use a concave mirror instead of a plane mirror?
1 markCase study: A shopkeeper installs a convex mirror at the corner of his shop to monitor customers. Meanwhile, a dentist uses a concave mirror while examining a patient\'s teeth. Answer the following questions: (c) State one difference between the images formed by these two mirrors.
1 markCase study: A shopkeeper installs a convex mirror at the corner of his shop to monitor customers. Meanwhile, a dentist uses a concave mirror while examining a patient\'s teeth. Answer the following questions: (d) If the dentist moves the mirror too far from the tooth, how will the image change?
1 mark