Two thin lenses of power +5D and -2D are placed in contact with each other. What is the focal length of the combination?
+3m
-3m
+0.33m
-0.33
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
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
What is the reciprocal of the power of a lens and find out the focal length of a lens if the power is1D?
Focal length, 100cm
Power of accommodation, 10cm
Far point, 1/100cm
Focus, 1/10cm
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
A light ray in air enters and passes through a block of glass. What can be started with regard to its speed after it emerging from the block?
Speed is less than when in glass
Speed is less than before it entered glass
Speed is same as that in glass
Speed is same as that before it entered glass
Sunsets often have a reddish- orange color associated with them. Which phenomenon does the attribute?
Polarization
Diffraction
Dispersion
Refraction
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
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
An object is placed at a distance of 30.0cm from a thin converging lens a long its axis. The lens has a focal length of 10.0cm. What are the values of the image distance and magnification (respectively)?
60.0 cm and 2.00
15.0 cm and 2.00
60.0 cm and 5.00
15.0 cm and -0.500
