Chapter 6: Geometrical Optics Physics Mcqs for High School - Grade 10 - Set 4

1)   A girl 1.8 m tall is standing 2.8 m in front of a camera which is using a convex lens having a focal length of 0.04 m. The image is

a. not formed
b. real
c. virtual
d. fake image
Answer  Explanation 

ANSWER: real

Explanation:
No explanation is available for this question!


2)   If the object is towards the left side of the lens, the object distance will be

a. zero
b. constant
c. positive
d. negative
Answer  Explanation 

ANSWER: positive

Explanation:
No explanation is available for this question!


3)   The relation between the object and image distance from the lens in terms of the focal length of the lens is called

a. fiber optics
b. lens formula
c. ohm's law
d. optical law
Answer  Explanation 

ANSWER: lens formula

Explanation:
No explanation is available for this question!


4)   The entire light is reflected into the denser medium, which is called total

a. internal reflection of light
b. external reflection of light
c. internal refraction of light
d. external refraction of light
Answer  Explanation 

ANSWER: internal reflection of light

Explanation:
No explanation is available for this question!


5)   The relationship between object distance (p), image distance (q) from the mirror and focal length (f) of the mirror is known as

a. glass formula
b. mirror formula
c. speed formula
d. energy formula
Answer  Explanation 

ANSWER: mirror formula

Explanation:
No explanation is available for this question!


6)   The distance between the optical center and principal focus is

a. radius
b. focal length
c. linear length
d. 2 focal lengths
Answer  Explanation 

ANSWER: focal length

Explanation:
No explanation is available for this question!


7)   If fo is the focal length of the objective and fe is the focal length of the eyepiece, then magnification of a refracting (M) telescope can be determined as

a. M = fo/fe
b. M = fo + fe
c. M = fo - fe
d. M = fe/fo
Answer  Explanation 

ANSWER: M = fo/fe

Explanation:
No explanation is available for this question!


8)   The mirror formula is

a. 1⁄f + 1⁄p + 1⁄q
b. 1⁄f = 1⁄p + 1⁄q
c. 1⁄p + 1⁄q
d. 1⁄p = 1⁄f x 1⁄q
Answer  Explanation 

ANSWER: 1⁄f = 1⁄p + 1⁄q

Explanation:
No explanation is available for this question!


9)   If a concave lens has a focal length of 15 cm and image distance is 10 cm then object distance is

a. 30 cm
b. 50 cm
c. 40 cm
d. 60 cm
Answer  Explanation 

ANSWER: 30 cm

Explanation:
No explanation is available for this question!


10)   One side of the spherical mirror is opaque and the other side is

a. non reflecting
b. translucent
c. transparent
d. reflecting
Answer  Explanation 

ANSWER: reflecting

Explanation:
No explanation is available for this question!


11)   A telescope that uses two converging lenses is called

a. reflecting telescope
b. refracting telescope
c. simple telescope
d. compound microscope
Answer  Explanation 

ANSWER: refracting telescope

Explanation:
No explanation is available for this question!


12)   A convex lens of focal length 8 cm is to be used to form a virtual image 2 times the size of the object. Where must the lens be placed?

a. 3 cm
b. 4 cm
c. 5 cm
d. 8 cm
Answer  Explanation 

ANSWER: 4 cm

Explanation:
No explanation is available for this question!


13)   The core is made of glass or plastic of relatively

a. zero refractive index
b. high refractive index
c. low refractive index
d. no refractive index
Answer  Explanation 

ANSWER: high refractive index

Explanation:
No explanation is available for this question!


14)   The minimum distance of an object from the eye at which it produces a sharp image on the retina is known as

a. accommodation
b. near point
c. far point
d. hypermetropia
Answer  Explanation 

ANSWER: near point

Explanation:
No explanation is available for this question!


15)   The size of the image depends on the position of the object in

a. plane mirror
b. convex mirror
c. concave mirror
d. silver mirror
Answer  Explanation 

ANSWER: concave mirror

Explanation:
No explanation is available for this question!


16)   If an object is 14 cm in front of the convex mirror and image distance is 5.8 cm then it's focal length is

a. -20 cm
b. -4.1cm
c. -9.9 cm
d. -8.2 cm
Answer  Explanation 

ANSWER: -4.1cm

Explanation:
No explanation is available for this question!


17)   Rough surfaces reflect rays of light in

a. two directions
b. one direction
c. many directions
d. no direction
Answer  Explanation 

ANSWER: many directions

Explanation:
No explanation is available for this question!


18)   Speed of light in air/speed of light in a medium is equal to the index of

a. defraction
b. acoustics
c. reflection
d. refraction
Answer  Explanation 

ANSWER: refraction

Explanation:
No explanation is available for this question!


19)   A magnifying glass is also called

a. telescope
b. compound microscope
c. simple microscope
d. endoscope
Answer  Explanation 

ANSWER: simple microscope

Explanation:
No explanation is available for this question!


20)   The critical angle for glass is

a. 50 °
b. 42 °
c. 45 °
d. 30 °
Answer  Explanation 

ANSWER: 42 °

Explanation:
No explanation is available for this question!