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Syllabus

DERIVATION OF MIRROR FORMULA.

Q. If radii of curvature of both convex surfaces is 20 cm, then focal length of the lens for an object placed in air in the given arrangement is

(1) 10 cm

(2) 20 cm

(3) 40 cm

(4) 80 cm

suggest me a working model project in physics

what is the meaning of scattering of light?

1.5/3

2.5/4

3.16/15

4.1.5

Derive an expression for the focal length of the combination of two thin lenses when they are SEPERATED by a small distance?

difference between extrinsic and intrinsic semiconductor

1)20cm 2)30cm 3)40cm 4)12cm

cbse XII physics investigatory project-

3.To find the refractive indices of (a)water (b) oil (transparent) using a plane mirror , a equiconvex lens and an adjustable object needle.

please answer!!

Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3mm. If speed of light in material of

how does focal length of a lens depends on the wavelength of light passed through?according to me the focal length should not change as focal length is a physical quantity of a lens so it should not change.

For the same value of angle of incidence the angle of refraction in three media A,Band C are 15 degree,25 degree and 35 degree respectively.in which medium the velocity of light be minimum?

1)30degree 3)48degree 3)52degree 4)58degree

derive F=R/2 for convex mirror

A thin equiconvex glass lens of refractive index 1.5 has power of 5D.When the lens is immersed in a liquid of refractive index "s" it acts as divergent lens of focal length 10ocm. the value if "s" is??

Why the uv graph of concave mirror is parobilic and1/u and1/v graph is a linear graph???

of the refractive index of the material of the rod the light once entered into it will not leave it through its

lateral face whatsoever be the value of angle of incidence?

1. n = 1.1

2. n = 1

3. $n\sqrt{2}$

4. n= 1.3

derive lens maker formula by concave lens

A convex lens of focal length 20cm is placed coaxially with a convex mirror of radius of curvature 20cm. The two are kept 15 cm apart. A point object is placed 40cm in front of the convex lens.Find the position of the image formed by the combination .

1)root of m1*m2

2)d/root of m1_m2

3)dm1*m2/m1_m2

4)d/m1_m2

1)50cm 2)20cm 3)40cm 4)25cm

1- deviate the ray through 180 degree

2- deviate the ray through 90 degree

3- invert the ray ..

1)root 2/3 2)3/2 3)root3/2 4)root3

prove that light waves are transverse in nature

A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.)

Q.33. A vessel consists of two plane mirrors at right angles (as shown in figure). The vessel is filled with water. The total deviation in incident ray is

(1) 0$\xb0$

(2) 90$\xb0$

(3) 180$\xb0$

(4) 45$\xb0$

Explain Mirage formation?

(1) 24cm from the surface

(2) 36cm from the centre

(3) 24cm from the centre

how can we identify convex and concave lens without touching them?

practical reading of determination of refractive index of a glass slab using a travelling microscope

Q. A sphere of glass (refractive index= 1.5) is of 20 cm diameter. A parallel beam enters it from one side. Where will it get focussed on the other side?

Explain it with the help of diagram.

v versus u graph for convex and concave mirror

(1) 2 sin A

(2) 2 cos A

(3) $\frac{1}{2}\mathrm{cos}A$

(4) tan A

(1) 3 cm (2) 4 cm (3) $\frac{8}{3}$ cm (4) 6 cm

(1) is less than 1

(2) is greater than 2

(3) lies between $\sqrt{2}$ and 1

(4) lies between 2 and $\sqrt{2}$

a double convex lens made of glass of refractive index 1.5 has its both surfaces of equal radii of curvature of 20 cm each an object of 5 height is placed at a distance of 10 cm from the lens .find the position ,nature and size of the image

_{2}will be : (in cm)(1) 5, 10, 15 (2) 5, 15, 30 (3) 5, 25, 35 (4) 5, 15, 25

what is the formula for finding lateral displacement?

Q.30. A red colour in air has wavelength 760 nm when light passes through water of refractive index $\left(n=\frac{4}{3}\right)$, wavelength becomes 570 nm. (wavelength of yellow colour in air is 570 nm). Then colour of red light in water is

(1) Red

(2) Green

(3) Yellow

(4) Blue

Derive a relation between the focal length and radius of curvature of a Plano convex lens made of

Q.15. A plot between the angle of deviation and angle of incidence is shown in figure. From the graph one can say that the prism angle is

(1) 47$\xb0$

(2) 46$\xb0$

(3) 45$\xb0$

(4) 60$\xb0$

What is concave mirror used as shaving mirror?

calculate speed of light in a medium whose critical angle is 30 degree.

43. A convex lens of focal length 100 cm and a concave lens of focal length 10 cm are placed coaxially at a separation of 90 cm. If a parallel beam of light is incident on convex lens, then after passing through the two lenses the beam â€‹

(1)Converges (2) Diverges

(3) Remains parallel (4) Disappears.

(R1 = R2 = 10 cm) is cut in a cylinder of glass

refractive index (μ )=3/2.

The focal length and the nature of the lens is

(1) 15 cm, concave

(2) 15 cm, convex

(3) ∞, neither concave nor convex

(4) 0 cm, concave

Three rays of light red(R) ,green(G) and blue(B) are incident on the surface of a right angled prism normally on its perpendicular.The refractive indices for the material of tha prism for red,green and blue are 1.39,1.43,1.47 respectively.Trace the path of the rays through the prism.How will the situation change if the rays were falling normally on one of the faces of an equilateral prism?

Q. In a medium of refractive index 1.6 and having a convex surface has a point object in it at a distance of 12 cm from the pole. The radius of curvature is 6 cm. Locate the image as seen from air

(1) A real image at 30 cm

(2) A virtual image at 30 cm

(3) A real image at 4.28 cm

(4) A virtual image at 4.28 cm

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20 cm, and (b) a concave lens of focal length 16 cm?

draw a labelled ray diagram to show the formation of image in an astronomical telescope in the normal adjustment position and write the expression for its magnifying power.

a ray of light passes through an equilateral glass prism such that angle of incidence is equal to the angle of emergence.if the angle of emergence is 3/4 times angle of prism.calculate the refractive index of prism.

What is the difference between crown glass and flint glass?

draw a plot showing the variation of power of a lens with the wavelength of incident light.

The central fringe of a interference pattern produced by light of wavelength 6000 Angstrom is found to shift to the position of 4

^{th}bright fringe after a glass plate of refractive index 1.5 is introduced . The thickness of the glass plate would be (in mu-m)1)4.8

2)8.23

3)14.98

4)3.78...........

if a covex lens is cut horizontally from the middle what will happen to its focal length?also consider the case of a concave lens.

you are given following three lenses. which two lenses will you use as an eyepiece and as an objective to construct an astronomical telescope?

L power aperture

L1 3D 8cm

L2 6D 1cm

L3 10D 1cm

Use the mirror equation to deduce that:

(a)an object placed betweenfand 2fof a concave mirror produces a real image beyond 2f.(b)a convex mirror always produces a virtual image independent of the location of the object.(c)the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole.(d)an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.[

Note:This exercise helps you deduce algebraically properties ofimages that one obtains from explicit ray diagrams.]

draw a labelled ray diagram of compound microscope and explain its working.

a glass slab of thickness 4cm contains the same no of wavelength 5 cm of water when both are travnersed by same monochromatic light .calculate the r.i of glass

plzz explain the construction and working og a compound microscope.... plzz

A ray of light PQ is incident at an angle of 60 degree on the face of AB of prism of angle 30 degree . The ray emerging out of the prism makes an angle of 30 degree with the incident ray. Show that the emergent ray is perpendicular to the face BC through which it emerges. Also calculate the refrractive index of the prism material.?plz reply soon.

An air bubble in a glass slab of refractive index 1.5 is 6cm eep as viewed from one face and 4cm deeo as viewed from the nother face. What is the thickness of the glass slab?

how does the focal length of a convex lens change if monochromatic red light is used instead of monochromatic blue light?

a sunshine recorder globe of 30cm in diameter is made of glass slab of refractive index 1.5.a ray enters the globe parallel to the axis.find the position from the centre of the sphere where the ray crosses the axis.

state and explain faraday's laws of electromagnetic induction. deduce an expressionfor the induced emf in a coilrotating uniformly in a uniform magnetic field.

how to draw Compound Microscope ray diagram step wise?how to draw Compound Microscope ray diagram step wise?

An object is placed at a distance of 15 cm from the convex lens of focal length 10 cm . on the other side of the lens , a convex mirror is placed such that its distance from the lens equals the focal length of the lens. The image formed by this combination is observed to coincide with the object itself. find the focal length of convex mirror..

Q.16. In the diagram a ray is passing through a broken prism, find angular deviation for the ray

(1) 105$\xb0$

(2) 30$\xb0$

(3) 60$\xb0$

(4) 15$\xb0$

Q.25. A convex lens of power + 2.5 D is in contact with a concave lens of focal length 25 cm. The power of combination is

(1) - 1.5 D

(2) 0 D

(3) + 1.5 D

(4) + 6.5 D

Does critical angle depend on color of light? Explain.

draw a labelled ray diagram to show the image formatin in a refracting type astonimical telescope.

1)5*10^_8s 2)5*10^_10s 3)2.5*10^_10s 4)2.5 *10^_8s

(a)A giant refracting telescope at an observatory has an objective lens of focal length 15 m. If an eyepiece of focal length 1.0 cm is used, what is the angular magnification of the telescope?(b)If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 × 10^{6}m, and the radius of lunar orbit is 3.8 × 10^{8}m.A lens behaves as a converging lens in air and a diverging lens in water (u = 4/3). What will be the condition on the value of refractive index (u) of the material of the lens ?

Q.4. A square ABCD of side 1 mm is kept at distance 15 cm infront of the concave mirror as shown in the figure. The focal length of the mirror is 10 cm. The length of the perimeter of its image will be :

(A) 8 mm

(B) 2 mm

(C) 12 mm

(D) 6 mm