achromatic lens मीनिंग इन हिंदी

संज्ञा • वर्णहीन लेन्स • अवर्ण लेन्स • अवर्णी लेंस	• अवर्णक लेन्स

achromatic: अवर्णक अवर्णी
lens: शीशा कांच लेंस

अधिक: आगे

In 1765, he introduced an astronomical instrument fitted with two achromatic lenses.
This lens had the largest aperture of its day for an achromatic lens.
Had he done so, he would almost certainly have invented the achromatic lens.
He suggested using two achromatic lenses of " six inches focus " placed apart.
The 1955 model came with a meniscus lens, later replaced with an achromatic lens.
It is a refractor with double achromatic lenses of 40 cm diameter and has 5m focal length.
The difficulties of fabricating two disks of optical glass required to make a large achromatic lens were formidable.
Achromatic lenses are corrected to bring two wavelengths ( typically red and blue ) into focus in the same plane.
The glass blanks were ground and polished into a 12-inch achromatic lens by Brashear & Co in 1920.
Malcolm used an original design incorporating achromatic lenses like those used in telescopes, and improved the windage and elevation adjustments.

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