What is the SI unit of the Power of lens and what type of lens is used in a simple microscope?
Metre, biconcave
Dioptre, biconvex
Cm, Plano Convex
Watt, cylindrical
An object is placed at a distance of 25cm from a convex lens whose focal length is 10cm. What will be the image distance?
50cm
16.66cm
6.66cm
10cm
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
How is the final image of an astronomical telescope formed?
Inverted
Erected
Neither inverted nor erected
Diminished
Combining red and green light (with equal intensity) makes ________ light; combining red and blue light (with equal intensity) makes _______ light; and combining blue and green light (with equal intensity) makes _______ light. Choose the three colors in respective order.
brown, purple, aqua
brown, magenta, yellow
yellow, magenta, brown
yellow, magenta, cyan
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
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 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 list is the correct primary color list?
blue, green, yellow
blue, red, yellow
red, blue, green
white, black, grey
