Light (10)
Reflection; Spherical Mirrors - Concave and Convex; Mirror Formula and Magnification; Refraction - Glass Slab, Refractive Index; Spherical Lenses; Lens Formula and Magnification; Power of a Lens
The power of a lens is +4D. Find the focal length of this lens
The power of a lens is +4D. Find the focal length of this lens. An object is placed at a distance of 50 cm from the optical centre of this lens.
...An object of height 10 cm is placed 25 cm away
An object of height 10 cm is placed 25 cm away from the optical centre of a converging lens of focal length 15 cm. Calculate the image-distance
...The ability of a medium to refract light is expressed in terms of its optical density
The ability of a medium to refract light is expressed in terms of its optical density. Optical density has a definite connotation. It is not the
...Define the following terms in the context of a diverging mirror
Define the following terms in the context of a diverging mirror :
- Principal
To get an enlarged, real and inverted image of an object
To get an enlarged, real and inverted image of an object by a concave mirror, where should the object be placed ? Draw a labelled ray diagram to
...The absolute refractive index of Ruby is 1.7
The absolute refractive index of Ruby is 1.7. Find the speed of light in Ruby. The speed of light in vacuum is 3 x 108 m/s.
Name the type of mirror which facilitates
Name the type of mirror which facilitates
- Shaving,
- Observing large images of the
Is the type of lens used converging or diverging
Study the ray diagram given below and answer the questions that follow:
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A 4 cm tall object is placed on the principal axis of a convex lens
A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and
...A student traces the path of a ray of light through a triangular glass prism for different values of angle of incidence
A student traces the path of a ray of light through a triangular glass prism for different values of angle of incidence. On analysing the ray
...A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence
A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence. He observes all
...A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen
A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram.
...A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to
...One half of a convex lens of focal length 10 cm is covered with a black paper
One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a
...What is meant by power of a lens ? Define its S.I. unit.
What is meant by power of a lens ? Define its S.I. unit.
You have two lenses A and B of focal lengths +10 cm and -10 cm respectively.
...What is meant by scattering of light
What is meant by scattering of light ? Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise.
If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished
If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it ?
...The absolute refractive indices of glass and water are 4/3 and 3/2 respectively
The absolute refractive indices of glass and water are 4/3 and 3/2 respectively. If the speed of light in glass is 2 x 108 m/s,
...Why does the sun appear reddish early in the morning
Why does the sun appear reddish early in the morning ? Will this phenomenon be observed by an astronaut on the Moon ? Give reason to justify your
...What is meant by power of a lens ? Write its SI unit
What is meant by power of a lens ? Write its SI unit. A student uses a lens of focal length 40 cm and another of -20 cm. Write the nature and
...State the laws of refraction of light. Explain the term absolute refractive index of a medium
State the laws of refraction of light. Explain the term ‘absolute refractive index of a medium’ and write an expression to relate it with the
...If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished
If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of
...A student traces the path of a ray of light through a glass prism
A student traces the path of a ray of light through a glass prism as shown in the diagram, but leaves it incomplete and unlabelled. Redraw and
...Draw the path of a ray of light when it enters one of the faces of a glass
Draw the path of a ray of light when it enters one of the faces of a glass slab at an angle of nearly 45°. Label on it (i) angle of refraction,
...A 10 cm tall object is placed perpendicular to the principal axis
A 10 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. The distance of the object from the
...A student holding a mirror in his hand, directed the reflecting surface of the mirror
A student holding a mirror in his hand, directed the reflecting surface of the mirror towards the Sun. He then directed the reflected light on to
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