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Syllabus

DERIVATION OF MIRROR FORMULA.

suggest me a working model project in physics

(A) zero

(B) 2 m/s towards mirror.

(C) 2 m/s away from mirror

(D) 4 m/s towards mirror.

The answer is (A)

what is the meaning of scattering of light?

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

R : The curvature of the lens at central and peripheral regions is different.

answer to this is giveN as 3.. why is reason wrong?

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.

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?

A thin prism of refracting angle 2 deviates an incident ray through an angle of 1. Find the value of refractive index of the material of the prism.

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.

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

derive F=R/2 for convex mirror

derive lens maker formula by concave lens

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

find the two values of object distance for which a convex lens of power 2.5 D will produce an image that is four times as large as the object.

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 .

n_{1}&n_{2}(n_{2}>n_{1}) respectively. Using this diagram, derive the relation$\frac{{n}_{2}}{v}-\frac{{n}_{1}}{u}=\frac{{n}_{2}-{n}_{1}}{R}$

Write the sign conventions used. What happens to the focal length of the convex lens when it is immersed in water?

1- deviate the ray through 180 degree

2- deviate the ray through 90 degree

3- invert the ray ..

(a) For what value of the angle of incidence, is the angle of emergence likely to be equal to the angle of incidence itself?

(b) Draw a ray diagram, showing the passage of a ray of light through this prism when the angle of incidence has the above value.

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

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.

1.5/3

2.5/4

3.16/15

4.1.5

Q(i). If f = 0.5 m for a glass lens, what is the power of the lens? (ii) The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm. Its focal length is 12 cm. What is the refractive index of glass? (iii) A convex lens has 20 cm focal length in air. What is focal length in water ? (Refractive index of air-water = $\frac{4}{3}$, refractive index for air-glass = $\frac{3}{2}$,)

prove that light waves are transverse in nature

Explain Mirage formation?

1)root of m1*m2

2)d/root of m1_m2

3)dm1*m2/m1_m2

4)d/m1_m2

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

a) one of the equal sides of this prism is deviated through 90 deg

b) The hypotenuse of this prism is deviated through 180 deg

c) Write 2 advantages of this prism over metallic surfaces as reflectors of light

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

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

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.

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

v versus u graph for convex and concave mirror

what is the formula for finding lateral displacement?

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

°just grazes the adjacent vertical surface after refraction,Find critical angle and refractive index of glassA diverging lens of focal length F is cut into two identical parts , each forming a plano concave lens. What is the focal length of each part?

Derive the formula :f = D(square) - d (square) / 4d where D is the distance between the object and the screen and d is ditance between two locations of convex lens and f is the focal length.

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

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

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?

What is concave mirror used as shaving mirror?

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?

ucm and distance of the image from the lens isvcm. The given graphs shows variation ofvwith(i) What is the nature of the lens?

(ii) Using the graph, find the focal length of this lens.

(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.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 biconvex spherical lens of has a focal length of 20 cm.if it is split along a plane vertically into two halves to form two plano-convex lenses. ,then what will be the length of each plano-convex lens.........

what if the lens be cut horizontally.......

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.

A point object is placed 60 cm in front of a CONVEX LENS OF FOCAL LENGTH 30 CM. A PLANE MIRROR IS PLACED 10 CM BEHIND THE LENS . WHERE IS THE IMAGE FORMED BY THE SYSTEM?

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.]

What is the difference between crown glass and flint glass?

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

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??

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

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 ?

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

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

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.

The Radius of Curvature of both the surfaces of lens are equal. If one of the surface is made plane by grinding how will the focal length and power change?

4. A ray of light falls on a transparent sphere with centre at C as shown in figure. The ray emerges from the sphere

parallel to line AB. The refractive index the sphere is:-

(A) $\sqrt{2}$

(B) $\sqrt{3}$

(C) 3/2

(D) 1/2

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..

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?

Q.3. A biconvex lens ($\mu $ = 1.5) of focal length 0.2 m acts as a divergent lens of power 1 D when immersed in liquid. Find the refractive index of the liquid.

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

a concave lens made of refractive index n

_{2}is held in reference medium of refractive index n_{1}. trace the path of parallel beam of light passing through the lens when1)n

_{1}<n_{2}2)n

_{1}>n_{2}explain with diagram and give appropriate reason?

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

Is focal length directly proportional to wavelength or inversely proportional to wavelenth?

Does critical angle depend on color of light? Explain.

26. For achromatic combination of lenses, if we use two lenses to focal length

flengthfandfrespectively and dispersive power $\omega $ and $\omega $'. then.$\left(1\right)\omega ={\omega}_{\circ},\omega \text{'}=2{\omega}_{\circ},f\text{'}=2f\left(2\right)\omega ={\omega}_{\circ},\omega \text{'}=2{\omega}_{\circ},f\text{'}-2f\phantom{\rule{0ex}{0ex}}\left(3\right)\omega ={\omega}_{\circ},\omega \text{'}=2{\omega}_{\circ},f\text{'}=\frac{f}{2}\left(4\right)\omega ={\omega}_{\circ},\omega \text{'}=2{\omega}_{\circ},f\text{'}=-\frac{f}{2}$