2 convex lenses
2 concave lenses
1 convex, 1 concave lens
1 convex and 1 plane mirror
If two mirrors are kept inclined at 60° to each other and a body is placed at the middle, then total number of images formed is :
Six
Five
Four
Three
A telescope has an objective lens of 10cm diameter and is situated at a distance of one kilometre from two objects. Find out the minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å.
0.5 m
5 m
5 mm
5 cm
Which of the following phenomenon is not explained by Huygen's construction of wavefront?
Refraction
Reflection
Diffraction
Origin of spectra
A lens is placed between a source of light and a wall. It forms images of area A1 and A2 on the wall, for its two different positions the area of the source of light is :
A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together. What will be their resulting power?
+ 6.5 D
- 6.5 D
+7.5 D
-0.75 D
Rainbows are formed by
reflection and diffraction
refraction and scattering
dispersion and total internal reflection
interference only
Interference is possible in
light waves only
sound waves only
Both light and sound waves
Neither light nor sound waves
For the given incident ray as shown in figure, the condition of total internal reflection of the ray will be satisfied if the refractive index of block will be
Which of the following phenomenon is not common to sound and light waves?
Interference
Coherence
Polarisation
