Odisha Board Solutions for Chapter: Refraction, Dispersion and Lens, Exercise 1: MODEL QUESTIONS

The minimum distance between object and it's real image formed by a convex lens is:

The absolute refractive index of the medium is always greater than one.

An astronaut in the spaceship sees the sky away from the sun as _____:

Does transparency of a medium depends upon it's thickness?

When a glass slab is placed on a cross made on a sheet, the cross appears raised up by $1 \mathrm{cm}$. Thickness of the glass is $3 cm$. What is the critical angle of the glass?

(Answer correct to two decimal places)

If the length of the day is defined as the time interval between sunrise and sunset, how will the day get affected if the earth loses it's the atmosphere:

Correct the following Sentence$:$ If the critical angle for a medium is $60°$, then the refractive index of the medium is $\sqrt{\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}$.

Correct the following Sentence$:$ The power of a convex lens of focal length $2$ meter is $2$ dioptre.