Related InterviewSolutions

• Image of an object approaching a convex mirror of radius of curvature 20m slong its optical axis is observed to move from `(25)/(3)`m to `(50)/(7)`m in 30 seconds. What is the speed of the object in km per hour?
• The `x-y` plane is the boundary between two transparent media. Medium-`1` with `z gt0` has refractive index `sqrt2` and medium `-2` with `zlt 0` has a refractive index `sqrt3`. `A` ray of light in medium `-1` given by the vector `A=6sqrt3 i+8sqrt3j-10k` is incident on the plane of separation. If the unit vector in the direction of refracted ray in medium `-2` is `(1)/(5) (ai+bj-(5)/(sqrt2)k)` then the value of ab.
• The refractive index of a glass is 1.520 for red light and 1.525 for blue light. Let `D_1` and `D_2` be angles of minimum deviation for red and blue light respectively in a prism of this glass. Then,A. `D_(1)` can be less than or greater than `D_(2)` depending upon the angle of prismB. `D_(1)gtD_(2)`C. `D_(1)ltD_(2)`D. `D_(1)=D_(2)`
• Refractive index of glass for red and violet colours are 1.50 and 1.60, repectively. Find: a. The refractive index for yellow colour, approximately b. Dispersive power of the medium.
• The focal lenghts of a convex lens for red, yellow and violet rays are `100cm, 99cm` and `98 cm` respectively. Find the dispersice power of the material of the lens.
• Find the focal length of a convavo-convex lens (Positive me menisus ) with `R_(1) = 15cm`, and `R_(2) = 25cm`. The refractive index of the lens material `n = 1.5`m `(1)/(f) = (1.5-1)((1)/(15)-(1)/(25)) = 0.5((10-6)/(150)), :. F = (300)/(4) = 75cm`
• A student performed the experiment of determination of focal length of a concave mirror by `u-v` method using an optical bench of length 1.5 meter. The focal length of the mirror used is 24 cm. The maximum error in the location of the image can be 0.2 cm. The 5 sets of `(u,v)` values recorded by the student (in cm) are: `(42,56),(48,48),(60,40),(66,33),(78,39)` . The data set (s) that cannot come from experiment and is (are) incorrectly recorded, is (are)A. `(42,560`B. `(48,48)`C. `(66,33)`D. `(78,39)`
• In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plitted using the same scale for the two axes. A straight line passing through the origin and making an angle of `45^circ` with x-axis meets the experimental curve at P. The coordinates of P will be.A. `((f)/(2),(f)/(2))`B. `(f,f)`C. `(4f,4f)`D. `(2f,2f)`
• An equilateral prism deviates a ray through `40^@` for two angles of incidence differing by `20^@`. The possible angles of incidences isA. `40^(@)`B. `50^(@)`C. `20^(@)`D. `60^(@)`
• 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. `2.4 m`C. `3.2 m`D. `5.6 m`