JEE Main 2014 (Offline) | Geometrical Optics Question 169 | Physics

A thin convex lens made from crown glass $$\left( {\mu = {3 \over 2}} \right)$$ has focal length $$f$$. When it is measured in two different liquids having refractive indices $${4 \over 3}$$ and $${5 \over 3},$$ it has the focal lengths $${f_1}$$ and $${f_2}$$ respectively. The correct relation between the focal lengths is :

$${f_1} = {f_2} < f$$

$${f_1} > f$$ and $${f_2}$$ becomes negative

$${f_2} > f$$ and $${f_1}$$ becomes negative

$${f_1}\,$$ and$${f_2}\,$$ both become negative

JEE Main 2014 (Offline)

MCQ (Single Correct Answer)

-1

A green light is incident from the water to the air - water interface at the critical angle $$\left( \theta \right)$$. Select the correct statement.

The entire spectrum of visible light will come out of the water at an angle of $${90^ \circ }$$ to the normal.

The spectrum of visible light whose frequency is less than that of green light will come out to the air medium.

The spectrum of visible light whose frequency is more than that of green light will come out to the air medium.

The entire spectrum of visible light will come out of the water at various angles to the normal.

JEE Main 2013 (Offline)

MCQ (Single Correct Answer)

-1

Diameter of a plano-convex lens is $$6$$ $$cm$$ and thickness at the center is $$3mm$$. If speed of light in material of lens is $$2 \times {10^8}\,m/s,$$ the focal length of the lens is

$$15$$ $$cm$$

$$20$$ $$cm$$

$$30$$ $$cm$$

$$10$$ $$cm$$

JEE Main 2013 (Offline)

MCQ (Single Correct Answer)

-1

The graph between angle of deviation $$\left( \delta \right)$$ and angle of incidence $$(i)$$ for a triangular prism is represented by