1
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
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 :
A
$${f_1} = {f_2} < f$$
B
$${f_1} > f$$ and $${f_2}$$ becomes negative
C
$${f_2} > f$$ and $${f_1}$$ becomes negative
D
$${f_1}\,$$ and$${f_2}\,$$ both become negative
2
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
The graph between angle of deviation $$\left( \delta \right)$$ and angle of incidence $$(i)$$ for a triangular prism is represented by
A
JEE Main 2013 (Offline) Physics - Geometrical Optics Question 212 English Option 1
B
JEE Main 2013 (Offline) Physics - Geometrical Optics Question 212 English Option 2
C
JEE Main 2013 (Offline) Physics - Geometrical Optics Question 212 English Option 3
D
JEE Main 2013 (Offline) Physics - Geometrical Optics Question 212 English Option 4
3
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-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
A
$$15$$ $$cm$$
B
$$20$$ $$cm$$
C
$$30$$ $$cm$$
D
$$10$$ $$cm$$
4
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
An object $$2.4$$ $$m$$ in front of a lens forms a sharp image on a film $$12$$ $$cm$$ behind the lens. A glass plate $$1$$ $$cm$$ thick, of refractive index $$1.50$$ is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus of film?
A
$$7.2$$ $$m$$
B
$$24$$ $$m$$
C
$$3.2$$ $$m$$
D
$$5.6$$ $$m$$
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