Hard

Light: Mirrors and Lenses — Hard

15 questions 18 min PYQ-grade reasoning

Q1. Assertion (A): The warning "Objects in mirror are closer than they appear" is written on side-view mirrors of vehicles. Reason (R): A convex mirror forms a diminished image, so distant objects look smaller and therefore farther away than they really are.
- A. Both A and R are true, and R is the correct explanation of A.
- B. Both A and R are true, but R is NOT the correct explanation of A.
- C. A is true, R is false.
- D. A is false, R is true.
Q2. Convex mirrors are installed at sharp road bends and intersections rather than concave mirrors because: I. Convex mirrors give a wider field of view of the road on both sides. II. Convex mirrors form an erect image so drivers can interpret vehicle motion quickly. III. Convex mirrors form an enlarged image of approaching vehicles.
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q3. A woman walks from a distance towards a large concave mirror in a museum. She will observe that
- A. Her erect image keeps decreasing in size.
- B. Her inverted image keeps decreasing in size.
- C. Her inverted image keeps increasing in size and eventually becomes erect and magnified.
- D. Her erect image keeps increasing in size at all times.
Q4. Three identical sketch-pen caps are placed in front of three mirrors. In one image, the cap looks the same size as the actual cap; in another, it looks larger; in the third, it looks smaller. The mirrors are, in order
- A. Plane, concave, convex
- B. Convex, plane, concave
- C. Concave, plane, convex
- D. Plane, convex, concave
Q5. A light ray makes an angle of 40° with the surface of a plane mirror (not the normal). The angle of reflection (measured from the normal) is
- A. 40°
- B. 20°
- C. 60°
- D. 50°
Q6. In Activity 10.5, a stiff paper sheet extends beyond a table. A light beam reflects off a mirror on the sheet onto the extended part. When the extended part is bent down along the table edge, the reflected beam disappears from it because
- A. The mirror absorbs the light when the sheet bends.
- B. The reflected ray no longer lies in the plane of the bent sheet.
- C. Reflection stops when the paper bends.
- D. The angle of incidence becomes 90°.
Q7. Which of the following statements about the laws of reflection are correct? I. They apply to plane mirrors only. II. They apply to spherical mirrors as well. III. Each ray of light at every point on a spherical mirror obeys these laws.
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q8. Assertion (A): A parallel beam falling on a concave mirror converges after reflection, while the same beam diverges from a convex mirror. Reason (R): The angle of incidence is not equal to the angle of reflection on spherical mirrors.
- A. Both A and R are true, and R is the correct explanation of A.
- B. Both A and R are true, but R is NOT the correct explanation of A.
- C. A is true, R is false.
- D. A is false, R is true.
Q9. Which statements about solar concentrators used in Indian villages are correct? I. They use mirrors (and sometimes lenses) to concentrate sunlight into a small area. II. The concentrated sunlight produces heat used for cooking food. III. Their main aim is to reflect light, not to produce heat.
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q10. Meena holds a magnifying glass close to printed text — letters appear larger. She slowly moves the lens away from the text. She will notice that
- A. The letters always remain erect and keep enlarging.
- B. The letters first enlarge, then become inverted and finally diminish.
- C. The letters always look smaller than the original size.
- D. The letters never change in size.
Q11. An object is placed behind a concave lens. As the object is slowly moved farther from the lens, the image seen through the lens
- A. First enlarges, then inverts.
- B. Always remains the same size.
- C. Stays erect but keeps getting smaller.
- D. Inverts after a certain distance.
Q12. Which statements correctly contrast a lens and a mirror? I. Light passes through a lens but is reflected by a mirror. II. We see things in a mirror but through a lens. III. Both lenses and mirrors can be made of opaque metal.
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q13. Which statements about images formed by a convex lens are correct? I. The image can be erect or inverted depending on the object's distance. II. The image can be enlarged, diminished or of the same size as the object. III. The image is always erect and diminished.
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q14. A flat piece of glass is ground into a curved surface. A reflective aluminium coating is applied on its outer (bulging) curved surface. The result is a
- A. Plane mirror
- B. Concave mirror
- C. Convex mirror
- D. Convex lens
Q15. A student wants to identify whether a mirror is plane, concave or convex without touching its surface. The single most reliable observation is to
- A. Note whether the image is erect at all object distances.
- B. Move the object closer and farther and watch how the image size and orientation change.
- C. Check whether the mirror reflects sunlight onto a wall.
- D. Look at the shape of the mirror's frame.

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