Referring to something that is not primary; second in rank or importance.

द्वितीयक

English Usage: The secondary spectrum of light can reveal hidden details in a painting.

Hindi Usage: प्रकाश का द्वितीयक स्पेक्ट्रम एक पेंटिंग में छिपे हुए विवरणों को प्रकट कर सकता है।

A range of different things, often relating to colors or light.

एक श्रृंखला

English Usage: The spectrum of opinions on the topic was very wide.

Hindi Usage: इस विषय पर रायों का श्रृंखला बहुत विस्तृत थी।