Question Text
Question 1 :
A wave has velocity v in medium P and velocity 2v in medium Q. If the wave is incident in medium P at an angle of 30, then the angle of refraction will be
Question 3 :
A person using a lens as a simple microscope sees an
Question 6 :
Assertion: Light waves have different refractive indices in different media.
Reason: Variations in the velocities of light in different media cause the refractive indices to be different.
Question 7 :
Focal length of converging combination of two lens is 20 cm. The ratio of dispersive power is 2:3. One of the focal length will be:
Question 8 :
A convex lens is in contact with a concave lens. The magnitude of the ratio of their focal lengths is 2/3. Their equivalent focal length is 30 cm. What are their individual focal lengths?<br>
Question 9 :
Two thin lenses have a combined power of $+9D$. When they are separated by a distance of $20\ cm$, their equivalent power becomes $+ \dfrac {27}{5}D$, then their individual powers are
Question 10 :
The glancing angle of incidence is $10^{\circ}$. What will be the glancing angle of reflection?