QQuestion
A convex lens forms a 10 times magnified image of an object. If the length of the object is 5 cm, determine the length of the image.
✓Answer
Magnification (m) = 10
Height of object (h₁) = 5 cm
Height of image (h₂) = ?
We know,
m = \frac{\text{h₂}}{\text{h₁}}
Therefore,
h₂ = m × h₁
= 10 × 5
= 50 cm
Hence, the length of the image is 50 cm.
Related Questions
More WBBSE Moderate level questions
At what angle must a light ray fall on the surface of an equilateral prism so that its angle of minimum deviation will be 20°? OR Calculate the time required by a ray of light to traverse a glass slab of thickness 2 mm. The refractive index of glass=1.5.
Establish the relationship between radius of curvature (r) and focal length (f) for a convex mirror. Write one use of a concave mirror. [2+1]
The magnified virtual image is formed by (a) convex mirror (b) convex lens (c) plane mirror (d) concave lens
The equation expressing the correlation between refractive index and wavelength of light is (a) μ = A + B/λ (b) μ = A + Bλ² (c) μ = Aλ + B (d) μ = A + B/λ²
If a reflected ray from a concave mirror makes an angle of 45° with the normal, the angle of incidence will be 90° 22.5° 135° 45°
Draw refracted rays for the incident rays which are parallel to the principal axis of a convex lens. Mark focus (F). [3] OR Explain the converging action of a convex lens. [3]
A light is incident from air medium on another medium. If the refractive index of this medium is 1.5 and the wavelength of light in this medium is 4000 Å what is the wavelength of light in the air medium ? What is the velocity of the light in this medium? [3] OR As a result of refraction of light through an equilateral prism the angle of deviation becomes 40°. If the path of the ray through the prism is parallel to the base of the prism, determine the angle of incidence at the first surface of prism. [3]
Determine the speed of a light ray passing through a glass slab of refractive index 1.5. [c = 3 × 10⁵ m s⁻¹]
Whether a concave lens is called a converging or diverging lens? Answer with reason.
Write Snell's law of refraction of light. OR Write two characteristics of the image of an extended object formed when it is placed in between the optical centre and focus of a thin convex lens.
What is meant by the principal axis of a concave lens?
Determine the angle of deviation for the refraction of light rays from rarer to denser medium. [2] (angle of incidence = i, angle of refraction = r) OR Why do the green leaves of trees appear 'green' in sunlight? [2]