Recently Active Optics Questions

The image of a small electric bulb fixed on the wall of a room is to be obtained on opposite wall 3m away by means of large convex lens.What is the maximum possible focal length for this purpose ?? ans:75cm but m not able to ...

Multi-correct. Q) In a prism of angle A and refractive index \mu , the maximum deviation occurs when - a) Angle of incidence is 90 deg. b) Angle of incidence is sin^{-1}\left(\left\{\sqrt{\mu^2-1} \right\}sinA-cosA \right) c) ...

*Image* *Image* *Image* circled questions are doubts ticked answers are my answers circles options are fiitjee answers ...

ncert class XII page 316....chapter 9 example 9.4 havin a doubt in this example.....when i solve it by differentiating th mirror equation wrt time....m getting an answer different from the achieved by the method shown here... ...

Consider a SMALL ANGLED PRISM placed between a point object O and a Concave Mirror (pole P) (OP<f). Then, why is it that the rays formed due to deviation by prism when traced back form an image in the plane of object or wh ...

There is an euiconvex glass lens with radius of each face as R and aμg = 3/2 and aμw = 4/3 . If there is water in object space and air in image space, then the focal length is: A) 2R B) R C) 3 R/2 D) R2 ...

Why does not a ray get reflected in the same path of incident ray?(ie trace its original path) Both the laws of reflection holds true ,i.e.they lie in the same plane and angle i =angle r.......... ...

A Diverging Lens is placed with its pole at the origin and its principal axis along the x-axis.Equation of an incident ray is given by y=- x/2 +3. The focal length of the lens is 4 cm.Find the equation of the divergent ray?? ...

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a ray incident on a plane mirror. for what angle of incident the ray wll undergo deviation of 4pi/5 radian ...

In a standard YDSE setup, two transparent slabs are placed in front of each of the slits. At the centre of the screen, one may locate 1. Central maxima 2. First maxima 3. First minima 4. Neither of maxima or minima ...

The wavelengths of k_{\alpha } and k_{\gamma } X- Rays are \lambda _{1} and \lambda _{2 } respectively. The wavelength of L _{\beta } X- Rays is A) \frac{\lambda _{1 } + \lambda _{2}}{2} B) \frac{\mid \lambda _{1 } - \lambda ...

A lens of focal length 15 cm is dipped in water. What is the new focal length given that ref index of glass wrt air is 3/2 and that of water wrt air is 4/3. If the lens is dipped in a liquid under what condition, the rays are ...

Q1) A man of height 2h stands in the middle of the room of length 6h. The height of the wall is 4h. What is the minimum length of a mirror to be placed on the wall in front of him so that he can see the entire wall behind him ...

In youngs double slit experiment the distance between slits is d. The distance between slits and screen is a. With help of wavelength L no. of fringes observed per metre on screen will be?????? ...

A converging and a diverging lens of equal focal lengths are placed co-axially in contact find the power and the focal length of the combination. ...

(IIT 1984 - Multi ans correct) White light is used to illuminate the 2 slits in a Young's double slit experiment.The separation between the slits is b and the screen is at a distance d(>b) from the slits.At a point on the ...

(In a double slit expriment, the two cohunt beams have slightly different intensities I and I + lI (lI << I). Show that the resultant intersity at the maxima is nearly 4I while that at minima is (dI)^2/4I ...

how to find the no. of maximas in the screen if the wavelength is given? ...

1.someone please help me out on this type of Q: when one side of a convex lens (of some given radius of curvature) is silvered and the object distance, refractive index of glass of lens is given. And we have to find the image ...

1. STATEMENT1--for achromatic combination of lenses ,nature of lenses should be opposite .i.e. one converging and the other diverging STATEMENT2.---relation between dispersive powers and focal length is w1/f1 +w2/f2=0 to remo ...

If the wavelength of incident light on a)concave mirror and b) convex lens is increased, how will the focal length of each of these change.Give reason. ...

which is the best sign convention in optics? ...

If two plane mirrors are placed perpendicular to each other , if a ray of light falls at an angle "a " with the plane of one mirror. Find the value of "a" so that reflected ray becomes parallel after reflection from second mi ...

A bird in air is diving veritcally over a tank with speed 5 cm/s. Base of tank is silvered. A fish in the tank is rising upward along the same line with speed 2 cm/s. Water level is falling at a rate of 2 cm/s.{n of wter is 4 ...

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find the resistance between the points a and b. please show me the full solution *Image* ...

A plane mirror is placed 25cm away frm a spherical concave mirror (R=40cm) perpendicularly to the principal axis of the concave mirror. Where is a candle placed, if its images formed by the two mirrors independently are at th ...

*Image* a parralle of beam of light falls on the quater of the cirlce of radius R as shown n the figure.RI of the quater of the cilcle is 3 nd of the surrouding medium is 1 . maximum value of OP as show in the figure so that ...

one face of an equiconvex lens of focal length 60 cm made of glass (μ=1.5) is silvered......does it behav lik a concave or covex mirror.....find effectiv f ...