1 nanometer = ?
1 nanometer = ?
- 10-3 meter
- 10-6 meter
- 10-9 meter
- 10-12 meter
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Which among the following types of lenses are prescribed by doctors for a patient suffering from astigmatism?
Which among the following types of lenses are prescribed by doctors for a patient suffering from astigmatism?A. Cylindrical Lens
B. Concave Lens
C. Spherical Lens
D. Convex LensAstigmatism is a common vision problem caused by an error in the shape of the cornea. With astigmatism, the lens of the eye or the cornea, which is the front surface of the eye, has an irregular curve. This can change the way light passes, or refracts, to your retina. This causes blurry, fuzzy, or distorted vision.
A cylindrical lens is a lens which focuses light into a line instead of a point, as a spherical lens would. The curved face or faces of a cylindrical lens are sections of a cylinder, and focus the image passing through it into a line parallel to the intersection of the surface of the lens and a plane tangent to it.The Doppler’s effect is applicable for_________?
The Doppler’s effect is applicable for_________?A. light waves only
B. sound waves only
C. Both Light waves and sound ways
D. None of theseAn apparent change in the frequency of waves, as of sound or light, occurring when the source and observer are in motion relative to each other, with the frequency increasing when the source and observer approach each other and decreasing when they move apart.
Hence, it is applicable for both sound and light waves.Symptoms of vitamin b7 deficiency are known to ______________.
Symptoms of vitamin b7 deficiency are known to ______________.A. Pellagra
B. Hair Loss
C. Muscle weakness
D. XerophthalmiaThe Reason for a Swimming Pool to appear Less Deep than the actual depth is__________?
The Reason for a Swimming Pool to appear Less Deep than the actual depth is__________?A. Refraction
B. Light scattering
C. Reflection
D. InterferenceA pool of water appears to be less deep than it actually is because light rays from bottom of pool are bent away from the normal as they pass from water into the air. This makes the pool appear shallower than it really is.
Because of the refraction of light.
Refection of Light:Refraction is the bending of light as it passes from one transparent substance into another.Light refracts whenever it travels at an angle into substance with a different refractive index.
Refraction is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media.Most gases conduct electricity at:
Most gases conduct electricity at:A. Normal pressure
B. Very low pressure
C. Very high pressure
D. None of theseDeuterium differs from Hydrogen in having:
Deuterium differs from Hydrogen in having:
A. Different atomic number but same atomic weight
B. Different atomic number and different atomic weight
C. Same atomic number and different atomic weight
D. None