Which of the following describes the best, what will happen to a light ray incident on an air- to- glass - boundary?
Total reflection
Total Transmission
Partial reflection, partial transmission
Partial reflection, total transmission
Which of the following cannot be considered for the determination of the angle of deviation of a prism?
The refracting angle
The angle of incidence of the ray
The refractive index of the prism material
The thickness of the prism
Through which part of the lens the ray of light without suffering deviation and in which position is the object placed if a convex lens always gives real image?
Optical centre, focus
pole, focus
focus,beyond centre of curvature
Optical centre, beyond centre of curvature
If a lens gives a positive magnification greater than unity, then what type of image does it indicate?
Real and inverted image having smaller size than the object
Virtual and upright image having larger size than the object
Real and upright image having smaller size than the object
Virtual and inverted image having larger size than the object
Sunsets often have a reddish- orange color associated with them. Which phenomenon does the attribute?
Polarization
Diffraction
Dispersion
Refraction
Find out the false statement with regard to refraction.
It is a change in direction of light when it passes from one transparent medium into another of different optical density.
Light is deviated away from the normal when it enters an optically dense medium from a less dense medium.
The velocity of light and wavelength are changed during refraction.
The angle of refraction is different for light of different wavelength
Which of the following describes the best image for a thin converging lens that forms whenever the object is at a distance less than the focal length from the lens?
Inverted, enlarged and real
Upright,enlarged and virtual
Upright, reduced and virtual
Inverted, reduced and real
A Convex lens forms a real and inverted image of a needle at a distance of 25cm from a lens. If the image is the same size as that of the needle, where should the needle be placed in front of the lens? Calculate the power of the lens.
the needle be placed at a distance of 25cm in front of the lens and the power is +0.08D
the needle be placed at a distance of 12.5cm in front of the lens and the power is +0.08D
the needle be placed at a distance of 25cm in front of the lens and the power is +8D
the needle be placed at a distance of 12.5cm in front of the lens and the power is +8D
Which list is the correct primary color list?
blue, green, yellow
blue, red, yellow
red, blue, green
white, black, grey
An object is placed 12cm away from a convex lens whose focal length is 10cm. What will the nature of the image formed?
Virtual and enlarged
Virtual and reduced in size
Real and reduced in size
Real and enlarged