Light- Reflection and Refraction_Human Eye_Mcq'_Class 10

Light

(Q.1)  Negative value of focal length of a spherical mirror indicates that it is

(a) Concave mirror(b) Convex mirror(c) Plane mirror(d) Convex mirror of small focal length
 

(Q.2)  Light is a form of ___________ radiation

(a) Electrical    (b) Mechanical            (c) Longitudinal          (d) Electomagnetic
 

(Q.3)  A ________ image can be obtained on a screen.

(a) Real           (b) Virtual       (c) Erect          (d) Inverted
 

(Q.4)  Refraction of light can take place at the boundary of

(a) Transparent media (b) Opaque media       (c) Any medium          (d) Rarer medium
 

(Q.5)  According to the laws of reflection

(a) Angle i = Angle r   (b) Sine i = sine r         (c) Sine i / Sine r = constant    (d) tan i = tan r
 

(Q6)  An object placed at F of a concave mirror will produce an image

(a) At focus                 (b) Diminished            (c) Real and Inverted              (d) Virtual
 

(Q.7)  An object placed at infinity of a concave mirror will produce an image

(a) Behind the mirror  (b) Diminished            (c) Virtual and erect    (d) Enlarge
 

(Q.8)  An object placed at F of a concave lens will produce an image

(a) On opposite side of the object      (b) Enlarge      (c) Virtual and erect(d) Real and inverted

(Q.9)  An object placed at 2F of a convex lens will produce an image
(a) At 2F         (b) Enlarge      (c) Real and Inverted  (d) Virtual  (Q.10)  An object placed between F and 2F of a convex lens will produce an image

(a) Virtual       (b) Diminished            (c) Real and Inverted  (d) Erect
 

(Q.11)  According to the laws of refraction (Snell’s law)
(a) Angle i = Angle r   (b) Sine i = sine r  (c) Sine i / Sine r = constant(d) an i= tan r    (Q.12)  Absolute Refractive index of a substance is

(a) Speed of light in vacuum / Speed of light in the medium
(b) Speed of light in water / Speed of light in the medium
(c) Speed of light in the medium / Speed of light in air
(d) Speed of light in medium/speed of light in water
 

(Q13.)  According to Cartesian Sign Convention

(a) Object distance is always negative            (b) Object distance is always positive
(c) Image distance is always negative             (d) Image distance is always positive
 

(Q.14)  Magnification produced by a concave mirror is

(a) Negative for a real image and Positive for a virtual image
(b) Only positive         (c) It produces no magnification         (d) Only negative
 

(Q.15)  A ray of light propagates from an optically denser medium to an optically rarer medium.

(a) It will bend towards the normal after refraction.
(b) It will bend away from the normal after refraction.
(c) It will continue to go on the same path after refraction.
(d) It will refract making an angle of refraction equal to the angle of incidence.
 

(Q.16)  Radius of curvature of a spherical mirror (or lens) is

(a) Half of its focal length                  (b) Double of its focal length
(c) Equal to its focal length                 (d) There is no relation
 

Q.17)  The distance between a spherical lens and the image is – 15 cm. The lens is

(a) Concave lens(b) Convex lens(c) Either of the two irrespective of the object distance(d) Either Concave lens or Convex lens with object between O and F.
 

(Q.18)  Power of a lens is

(a) Equal to its focal length                (b) Reciprocal of the focal length (in meters)
(c) Square of its focal length               (d) Reciprocal of its radius of curvature
 

(Q.19)  Lens formula is expressed as

(a) 1/v - 1/u = 1/f         (b) 1/v + 1/u = 1/f       (c) 1/u - 1/v = 1/f         (d) u + v = f

(Q.20)  The colour of an object is determined by

(a) The colour of light reflected by it.                        (b) The colour of light absorbed by it.
(c) The colour of light incident on it only.      (d) The colour of light transmitted by it.
 

(Q.21)  The three primary colours are
(a) Red, Blue and Green  (b) Red, Yellow and Blue  (c) Red, White and Blue  (d) Violet, Green and Red  (Q.22)  Convex lenses are also called
(a) Converging lenses (b) Diverging lenses    (c) Circular lenses        (d) Plane lenses  Q.23)  In which case the image formed by a concave mirror is of the same size as the object?

(a) When object is placed at infinity(b) When object lies at C(c) When object lies at F
(d) When object lies between C and F