Q6. The distance estimation for which ray optics is good approximation for an aperture of 3 mm and w

Q: What is the correct answer for CUET UG Physics Q6?

The correct answer is b. Ray optics is a good approximation as long as diffraction effects are negligible. The criterion for the validity of ray optics is often given in terms of the Fresnel distance (Z), which indicates the distance up to which ray optics can be considered valid for a given aperture size and wavelength. The Fresnel distance is calculated as Z = a²/λ, where 'a' is the aperture size and 'λ' is the waveleng

Q: Q6. The distance estimation for which ray optics is good approximation for an aperture of 3 mm and wavelength 300 nm would be: (a) 40 m (b) 30 m (c) 20 m (d) 10 m

The correct answer is b. Ray optics is a good approximation as long as diffraction effects are negligible. The criterion for the validity of ray optics is often given in terms of the Fresnel distance (Z), which indicates the distance up to which ray optics can be considered valid for a given aperture size and wavelength. The Fresnel distance is calculated as Z = a²/λ, where 'a' is the aperture size and 'λ' is the waveleng

Q: What are the options for this CUET UG Physics question?

A. 40 m · B. 30 m · C. 20 m · D. 10 m

Question

Q6. The distance estimation for which ray optics is good approximation for an aperture of 3 mm and wavelength 300 nm would be:
(a) 40 m
(b) 30 m
(c) 20 m
(d) 10 m

FirstInTest · Accepted Answer

Ray optics is a good approximation as long as diffraction effects are negligible. The criterion for the validity of ray optics is often given in terms of the Fresnel distance (Z), which indicates the distance up to which ray optics can be considered valid for a given aperture size and wavelength. The Fresnel distance is calculated as Z = a²/λ, where 'a' is the aperture size and 'λ' is the wavelength.Given:Aperture (a) = 3 mm = 3 × 10⁻³ mWavelength (λ) = 300 nm = 300 × 10⁻⁹ mCalculating the Fresnel distance:Z = (3 × 10⁻³ m)² / (300 × 10⁻⁹ m)Z = (9 × 10⁻⁶ m²) / (3 × 10⁻⁷ m)Z = 3 × 10¹ m = 30 m.Thus, ray optics is a good approximation for distances up to about 30 meters.

Answer

40 m

Answer

30 m

Answer

20 m

Answer

10 m

Related Questionsin Physics

More from CUET UG

Browse CUET Questions by Subject

Practice More CUET UG Questions