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Q1. Which of the following mirror is used by a dentist to examine a small cavity?
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Combination of convex and concave mirror
(c) Concave mirror
Q2. The distance between the object and image will be
(a) 0.25 m
(b) 1.0 m
(c) 0.5 m
(d) 0.125 m
(c) 0.5 m
Q3. An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get
a) shortened and real
(b) enlarged and real
(c) enlarge and virtual
(d) diminished and virtual
(d) diminished and virtual
Q4. An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and image will be
(a) 0.25 m
(b) 1.0 m
(c) 0.5 m
(d) 0.125 m
(d) 0.125 m
Q5. The power of a lens is -4.0 D. what is the nature of the lens?
(a) Plane
(b) Concave
(c) Convex
(d) Plano convex
(b) Concave
Q6. For a real object, which of the following can produce a real image?
(a) Plane mirror
(b) Concave mirror
(c) Concave lens
(d) Convex mirror
(b) Concave mirror
Q7. The nature of the image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is
(a) real, inverted and diminished
(b) virtual, erect and smaller in size
(c) real, inverted and enlarged
(d) virtual, upright and enlarged
(c) real, inverted and enlarged
Q8. In torches, search lights and head lights of vehicles the bulb is placed
(a) Between pole and focus
(b) Very near to the focus
(c) Between focus and centre of curvature
(d) At centre of curvature
(b) Very near to the focus
Q9. The focal length of concave mirror is 10 cm. The radius of curvature of mirror will be:
(a) 10 cm
(b) 20 cm
(c) 30 cm
(d) 40 cm
(b) 20 cm
Q10. The focal length of concave mirror is 15 cm. Its radius of curvature will be:
(a) 15 cm
(b) 30 cm
(c) 45 cm
(d) 60 cm
(b) 30 cm
Q11. The focal length of plane mirror is:
(a) Zero
(b) Infinite
(c) 25 cm
(d) 25 cm
(b) Infinite
Q12. The relationship between focal length and radius of curvature is:
(a) f = R
(b) f = \frac{1}{R}
(c) 2f = R
(d) f = 2R
(c) 2f = R
Q13. The focal length of a convex mirror is 12 cm. The radius of convex surface of the mirror will be:
(a) 6 cm
(b) 12 cm
(c) 18 cm
(d) 24 cm
(d) 24 cm
Q14. The object is placed at distance 10 cm in front of a plane mirror. The distance of image from mirror will be:
(a) 5 cm
(b) 10 cm
(c) 20 cm
(d) 0 cm
(b) 10 cm
Q15. The image formed by a mirror is always straight whatever will be the distance, then mirror is:
(a) Only plane
(b) Only concave
(c) Only Convex
(d) Either plane or convex
(a) Only plane
Q16. The image due to convex mirror is always formed:
(a) between centre of curvature and focus
(b) between centre of curvature and infinity
(c) between pole and focus
(d) anywhere
(c) between pole and focus
Q17. A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
(a) At infinity
(b) Between F and C
(c) Between P and F
(d) At E
(c) Between P and F
Q18. In optics an object which has higher refractive index is called
(a) Optically rarer
(b) Optically denser
(c) Optical density
(d) Refractive ind
(b) Optically denser
Q19. The optical phenomena, twinkling of stars, is due to
(a) Atmospheric reflection
(b) Total reflection
(c) Atmospheric refraction
(d) Total refraction
(c) Atmospheric refraction
Q20. Convex lens focus a real, point sized image at focus, the object is placed
(a) At focus
(b) Between F and 2F
(c) At infinity
(d) At 2F
(c) At infinity
Q21. The unit of power of lens is
(a) Metre
(b) Centimeter
(c) Diopter
(d) M-1
(c) Diopter
Q22. The radius of curvature of a mirror is 20cm the focal length is
(a) 20cm
(b) 10cm
(c) 40cm
(d) 5cm
(b) 10cm
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