In dispersion without deviation,_________________
Dispersion Without Deviation Explained
Dispersion involves the separation of white light into its constituent colors because the refractive index of a medium varies with wavelength. "Without deviation" signifies that the overall direction of the light beam remains unchanged, even though colors separate.
Analyzing Dispersion Without Deviation
In optical setups designed for dispersion without deviation, such as specific prism combinations (e.g., direct vision prisms):
- The separation of colors (dispersion) occurs due to different wavelengths refracting differently.
- The net effect is zero deviation, meaning the emergent beam is parallel to the incident beam.
Statement Completion and Justification
Completing the statement "In dispersion without deviation..." requires identifying which component aligns with the incident ray's direction. The correct option is:
Option C: yellow coloured ray is parallel to the incident ray
Reasoning: In common experimental setups engineered for dispersion without net deviation, the yellow light (often representing the mean wavelength) is typically designed to emerge parallel to the incident ray. While other colors like violet and red deviate slightly, they do so symmetrically around the yellow ray, ensuring the overall beam experiences no net angular shift. This makes the yellow ray the reference for zero deviation in these specific cases.
Why other options are incorrect:
- Option 1 is wrong because if all emergent rays were parallel to the incident ray, there would be no dispersion (separation of colors).
- Option 2 is incorrect as it implies a net deviation if the parallel emergent rays are not aligned with the incident ray.
- Option 4 is less precise; while red light might be parallel in certain specific theoretical cases, yellow light is the standard reference for zero deviation in practical direct vision prisms.
Similar Questions
- When an object is placed at infinity in front of a convex lens, the image formed is:
- A concave mirror is used in torches and car headlights because it:
- Which of the following statements correctly describes a double concave lens?
A convex mirror of focal length f (in air) is immersed in a liquid . The focal length of the mirror in liquid \(\left( {\mu - \frac{4}{3}} \right)\) will be:
The reflector of a searchlight is a:
If you look into a mirror and find that the image (your reflexion) is smaller than you, then the type of the mirror is:
The focal length of a concave mirror with a radius of curvature of 20.0 cm is:
Find the position of the image formed by a concave mirror when the object is placed between P and F?
A person holding a pen in his left-hand sees his reflection in the mirror holding the pen in his right hand. This is due to which of the following phenomena?
- A thin prism $P_1$ of angle $4^\circ$ and refractive index 1.54 is combined with another thin prism $P_2$ of refractive index 1.72 to produce dispersion without deviation. The angle of $P_2$ is
Important Questions from Optics
Which among the following is used as a reflector in search lights?
The incident ray, the ray perpendicular to the point of incidence, and the reflected ray all lie________.
Which is the only event to prove that light is a transverse wave?
A. Scattering of light
B. Interference
C. Diffraction
D. Polarisation
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
Which mirror is preferred as a rear-view (wing) mirror in vehicles because of its wider field of view?
