Physics - Study Mode

[#851] Optical fiber works on the principle of
Correct Answer

(C) Total internal reflection

Explanation

Solution: Optical fiber works on the principle of total internal reflection. The Total Internal Reflection is the phenomenon in which the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle.

[#852] Which one of the following is the correct sequence of passage of light in a compound microscope?
Correct Answer

(C) Condenser -Objective lens -Body tube -Eyepiece

Explanation

Solution: Condenser -Objective lens -Body tube -Eyepiece is the correct sequence of passage of light in a compound microscope.

[#853] In a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is
Correct Answer

(B) Decreased by 4%

Explanation

Solution: In a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is decreased by 4%.

[#854] Person who is colourblind cannot distinguish between
Correct Answer

(B) Red and green

Explanation

Solution: Person who is colourblind cannot distinguish between red and green.

[#855] Fiber optics cable used in communication, works on the principle of
Correct Answer

(D) Total internal reflection of light

Explanation

Solution: Optical communication utilizes the principle of total reflection. When the injection angle of light satisfies certain conditions, light can form total reflection in the optical fiber, thereby achieving the purpose of long-distance transmission.