Ray Optics and ...

A convex lens of focal length $$f$$ produces a real image 3 times the size of an object, then distance of the object from the lens is 

A ray of light is incident normally on one face of $$30^{ \circ  }-60^{ \circ  }-90^{ \circ  }$$ prism of refractive index 5/3 immersed in water of refractive index 4/3 as shown in figure .

Consider slabs of three media A,B and C arranged as shown in figure R.I of A is 1.5 and that of C is 1.4. If the number of waves in A is equal to the number of waves in the combination of B and C then refractive index of B is:

Two thin prisms are combined to form an achromatic combination.For prism I, $$  A=4^{0}, \mu_{R}=1.35, \mu_{Y}=1.40, \mu_{\nu}=1.42 .  $$ For prism II $$  \mu_{R}=1.7, \mu_{\gamma}=1.8  $$ and $$  \mu_{R}=1.9 .  $$ Find the prism angle of prism II and the net mean deviation.

A ray of light is incident on a glass at an angle of $$60^o$$. What would be the refractive index of glass, if reflected and refracted rays are perpendicular to each other ?

A glass slab of thickness 12 mm is placed on a table. The lower surface of the slab has a black spot. At what depth from the upper surface will the spot appear when viewed from above? (Refractive index of glass =1.5)

A right-angled prism is set to deviate a ray of light through $$90^o$$ . If the same prism is to be used for deviating through $$180^o$$ , the prism must be turned from the previous set position through the angle :

An object is seen through a glass slab of thickness 36 cm and refractive index 3/2. The observer, object and the slab are dipped in water (n= 4/3). the shift produced in the position of the object is 

A parallel air film is formed between two glass plates. If the film thickness is $$0.45\times 10^{-6} m$$, the film will be best reflector for visible light in the neighbourhood of

A student measures the focal length of a convex lens by putting an object pin at a distance 'u' from the lens and measured the distance 'v' of the image pin. The graph between 'u' and 'v' plotted by the student should look like